Powered by Lexis+®
Jurisdiction(s):
United Kingdom
CASE STUDY

“LexisPSL and the other Lexis solutions support our business in exactly the way we want. They enable us to quickly turn around work and deliver the best possible service to our clients.”

SBP Law

Access all documents on Lock-out mechanism

Lock-out mechanism meaning

What does Lock-out mechanism mean?
Lock-out mechanism describes a cash-market convention for calculating compounded SONIA in sterling loans and bonds. For the final days of an interest period (commonly five), the daily SONIA rate used in the compounding calculation is “locked” by repeating an earlier SONIA fixing, rather than using the actual overnight rates for those days. This gives borrowers and issuers advance certainty of the interest amount shortly before the payment date and simplifies operational processing. It is not defined in legislation or case law; the term reflects market practice developed during benchmark reform to risk-free rates. Key legal features include: (i) specifying the lock-out length, (ii) identifying the SONIA source (typically the Bank of England publication), (iii) stating the compounding formula and day-count convention, and (iv) setting fallbacks for non-publication or disruption. Usage is broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland for GBP exposures. While new sterling documentation often prefers a “lookback with observation shift”, lock-out drafting remains in circulation, particularly in legacy SONIA bonds and some loans. Compared with pure in-period compounding, a lock-out can introduce a small economic basis because the final days’ rates do not update.
Speed up all aspects of your legal work with tools that help you to work faster and smarter. Win cases, close deals and grow your business–all whilst saving time and reducing risk.

View the related Checklists about Lock-out mechanism

CHECKLISTS
Companies (Cross-Border Mergers) Regulations 2007 (archived): pre-Brexit timetable, court and Registrar process, shareholder/creditor approvals, and employee participation; revoked post-Brexit

NOTE: This archived timetable outlines the usual sequence for a merger under The Companies (Cross-Border Mergers) Regulations 2007, SI 2007/297, before those regulations were revoked at the end of the Brexit implementation period... Background The European framework governing combinations between companies in different EEA member states stems from Directive 2005/56/EC, the Directive on Cross-Border Mergers of Limited Liability Companies (Directive). The UK gave effect to the Directive through The Companies (Cross-Border Mergers) Regulations 2007, SI 2007/2974, as subsequently amended by SI 2008/583, SI 2011/1606 and SI 2015/180 (together, the Cross-Border Mergers Regulations). Beyond setting out a merger mechanism, the Cross-Border Merger Regulations also regulate employee participation arrangements (see Employee participation arrangements below). The City Code on Takeovers and Mergers (Code) applies in the usual manner and on the normal basis where at least one party to the merger falls within the Code’s scope. The Takeover Panel (Panel) has issued a practice statement offering practical guidance on how the Code operates in cross-border merger scenarios. For more detailed information,...

Read More Right Arrow
CHECKLISTS
Indemnity clauses in B2B commercial contracts: a practical drafting, negotiation and risk checklist covering losses, claims control, limitations, UCTA reasonableness, mitigation and insurance (English law)

Legal issues This checklist sets out the main terms and matters to bear in mind when preparing and negotiating indemnity provisions in commercial (business-to-business) contracts. For model wording with drafting notes, see Precedent: Indemnity clause-commercial contracts. For more on indemnities, consult the following Practice Notes: Indemnities in commercial contracts Guarantees and indemnities-general contract For a practical guide to reviewing an indemnity clause in B2B agreements, see Practice Note: How to review an indemnity clause. General comments What to watch out for Is an indemnity appropriate? An indemnity is a contractual promise by one party to reimburse the other for specified loss or damage or, in some instances, to relieve them from liability. Unlike a guarantee, it imposes a primary obligation that may not rely on a third party’s default. Assess if an indemnity is the right mechanism or whether a guarantee is preferable, for example where a parent company guarantees a subsidiary’s obligations. If advising the indemnifier, consider...

Read More Right Arrow
CHECKLISTS
Service out of the jurisdiction: judicial and extra-judicial international regime checklist for England and Wales (Hague Service Convention, Service Regulation (recast), bilateral treaties)

This Checklist helps identify the correct method of service when papers must be served outside the jurisdiction of the courts of England and Wales. It explains the formal service frameworks available for serving judicial and extra-judicial documents in a foreign state. The Checklist addresses the service mechanism under the Hague Service Convention, lists the territories to which that convention has been extended, and indicates whether any reservations, declarations or notifications have been recorded. For details on such reservations, declarations or notifications, consult: HCCH website—Service Section. This guidance focuses on cross-border service from England and Wales to overseas destinations and related procedural steps. How this checklist works To work out the applicable service framework using the table below, assess the relevant regime in: the country in which the document originates, and the country in which the document is to be served When the same regime is available in both countries, that regime governs. It is advisable to seek advice of a local...

Read More Right Arrow

View the related Flowcharts about Lock-out mechanism

FLOWCHARTS
NEC3/NEC4 Engineering and Construction Contract: Defects Process Flowchart (identification, notification and correction)

The Retained EU Law (Revocation and Reform) Act 2023 (REUL(RR)A 2023) confers a suite of legislative powers, allowing the relevant national authorities to reshape retained EU law (REUL) by making secondary legislation to amend, revoke, restate and/or replace REUL and assimilated law. Its principal powers are located in REUL(RR)A 2023, ss 11–16. The core procedural obligations (including parliamentary scrutiny routes) for these instruments appear in REUL(RR)A 2023, s 20 and Schs 4–5. REUL(RR)A 2023 sifting process—background Under REUL(RR)A 2023, before specified statutory instruments (referred to here as ‘REUL reform SIs’) are formally presented to Parliament, they must first undergo a preliminary sifting exercise to confirm the suitable parliamentary procedure. Details of the sifting mechanism are set out in REUL(RR)A 2023, Sch 5 Pt 2, para 6...

Read More Right Arrow

View the related News about Lock-out mechanism

NEWS
UK and EU environmental law weekly: consultations, policy and case updates across climate, hydrogen, buildings, enforcement, nuclear, ESG, chemicals (PFAS), biodiversity, waste and water—9 October 2025

In this issue: Air emissions and climate change Contamination and pollution Energy efficiency and buildings Energy for environmental lawyers Environmental information Environmental taxes, reliefs and incentives ESG and sustainability Hazardous substances and chemicals Nature, biodiversity and habitat conservation Waste Water, flooding and drainage Daily and weekly news alerts New and updated content Air emissions and climate change Greenhouse Gas Removals (GGR)-UK government publishes Business Model documentation On 27 August 2025, the Department for Energy Security and Net Zero (DESNZ) released a suite of papers on its proposed Greenhouse Gas Removals (GGR) Business Model and accompanying policy. The Lexis+ Energy team, working with Navraj Singh Ghaleigh, Senior Lecturer in Climate Law at the University of Edinburgh Law School, set out the context for the GGR Business Model; its relationship with the Power BECCS Business Model; the technologies the GGR framework intends to encompass; its legal footing and principal features; and how...

Read More Right Arrow
NEWS
Weekly energy law update: Ofgem decisions, grid and flexibility reforms, hydrogen/LDES support, CHMM guidance, CfD and planning changes, nuclear siting policy, EU State aid/infrastructure actions—13 March 2025

In this issue: Electricity and gas market regulation and licensing Renewable energy Capacity Market, balancing services and energy system flexibility Conventional power, waste to energy, biomass, and CHP projects Nuclear energy Planning issues in energy projects International energy Daily and weekly news alerts New and updated content Dates for your diary Trackers Electricity and gas market regulation and licensing Ofgem publishes determinations on code manager selection for REC and BSC Ofgem has issued two determinations, setting out its conclusions under section 187(1) of the Energy Act 2023 to move ahead with appointing code managers for the Balancing and Settlement Code (BSC) and the Retail Energy Code (REC) without running a competition. As a consequence, both the Retail Energy Code Company Ltd and Elexon Ltd will, respectively, be asked to provide a licensing assessment form. Ofgem will subsequently review the submissions and confirm whether it proposes to award each entity a licence. See:...

Read More Right Arrow
NEWS
UK corporate law weekly update: ECCTA reforms for LLPs, FCA NSM changes, NSIA review and case, EU board gender targets, High Court rulings and deadlines—9 January 2025

In this issue: Economic Crime and Corporate Transparency Act 2023 Equity capital markets Private M&A (share purchase) Corporate governance—EU Members Company restoration Daily and weekly news alerts Dates for your diary Trackers Useful information New Q&As Economic Crime and Corporate Transparency Act 2023 Companies and Limited Liability Partnerships (Protection and Disclosure of Information and Consequential Amendments) Regulations 2024 SI 2024/1377: These Regulations update LLP company law to reflect recent changes under the Economic Crime and Corporate Transparency Act 2023 and expand the scenarios in which a person’s residential address can be withheld from the company register, covering former registered office addresses, while maintaining corporate openness and aligning LLP provisions. They commence on 27 January 2025. See: LNB News 07/11/2024 27. Equity capital markets The Financial Conduct Authority has released Policy Statement PS24/19: Enhancing the National Storage Mechanism, setting out the feedback to Consultation Paper CP24/17, its longer-term vision for the NSM, and...

Read More Right Arrow

View the related Practice Notes about Lock-out mechanism

PRACTICE NOTES
Public sector equality duty in Wales: specific duties, equality impact assessments, objectives, gender pay action plans, procurement and enforcement (Equality Act 2010 (Statutory Duties) (Wales) Regulations 2011)

The public sector equality duty (PSED) Set out in Part 11 of the Equality Act 2010 (ss 149–159), the public sector equality duty (PSED) comprises a general equality duty applying UK-wide to public bodies listed in Schedule 19 of the EqA 2010, alongside specific duties intended to support delivery of the general duty and enhance transparency. Although the general duty is identical across England, Wales and Scotland, the specific duties made under EqA 2010, s 153 vary. In Wales, listed public bodies must meet particular specific duties that sit alongside the UK-wide general duty. These specific duties bind listed Welsh bodies only. They do not extend to non-devolved public authorities operating in Wales. Under EqA 2010, s 149, the general duty requires public authorities and those exercising public functions to have 'due regard' to the need to: eliminate discrimination, harassment, victimisation, and any other behaviour prohibited by or under the EqA 2010 advance equality of opportunity between people who share a relevant protected characteristic and...

Read More Right Arrow
PRACTICE NOTES
Practical guide to terminating ISDA-governed derivatives: defaults, termination events, Section 2(a)(iii), automatic early termination, notices, calculation statements, interest, close-out netting and resolution stays

Terminating a derivative under an ISDA Master Agreement When ending a derivatives contract documented under an ISDA Master Agreement, it is vital to follow the termination provisions exactly as drafted. Any misstep may mean the termination is not properly effected and could be invalid. Section 6 (Early Termination) details the outcomes that follow once an Event of Default or a Termination Event—each described in Section 5 (Events of Default and Termination Events)—has occurred. Put simply, an Event of Default involves fault attributable to a party, while a Termination Event usually arises without blame or beyond a party’s control. Section 6 also explains how the close-out netting mechanism operates after an Event of Default or Termination Event. For more detail, see Practice Notes: Scope of the ISDA Master Agreement part 4—Section 5 (Events of Default and Termination Events) and Scope of the ISDA Master Agreement part 5—Section 6 (Early Termination). Termination events...

Read More Right Arrow
PRACTICE NOTES
IChemE Burgundy Book 2nd Edition: target cost process plant contracts; key provisions on cost control, pain/gain sharing, testing, insurance, termination, liability caps, payment and disputes, with 2025 AI guidance

This practice note addresses the 2nd Edition of the Burgundy Book, released in 2013, with particular emphasis on its role as a target cost form. In line with all IChemE agreements, the Burgundy Book contains thorough requirements for testing at completion and for commissioning, making it especially well suited to process engineering sectors such as nuclear, water, petrochemicals, and food. The suite adopts an almost entirely uniform structure across clauses, presentation and schedules. Departure from the standard drafting occurs only where needed to set out the mechanism delivering the risk/reward regime—in this instance, remuneration on a target cost footing. See also Practice Notes: IChemE Conditions 5th Edition—‘Red Book’ and IChemE Conditions ‘Green Book’ 4th Edition. Nature of Target Cost Contracts Target cost denotes that the contractor receives payment of the ‘actual cost’ it incurs (as defined), akin to a reimbursable arrangement but constrained by an agreed target cost. Where the actual cost surpasses the target, any additional sum payable to the contractor is reduced—often to nil. If the...

Read More Right Arrow

View the related Precedents about Lock-out mechanism

PRECEDENTS
Property Development Agreement: Precedent Funder Step-in Rights Clause with Warning and Step-in Notice Mechanism

Note: This clause relies on the defined terms already set out in the Lexis+® UK Precedent Property development agreement: ‘Developer’, ‘Owner’, ‘Property’, ‘Working Day’ and ‘Works’. Further definitions are provided below. 1 Funder’s step-in rights 1.1 For the purposes of clause 1, ‘Funder’ denotes any lending institution to whom the Owner grants a charge over its interest in this Agreement or the Property as security for finance that allows the Owner to meet the cost of: acquiring, clearing and preparing the Property; [and] carrying out the Works[.]...

Read More Right Arrow
PRECEDENTS
Statutory adjudication in construction contracts: procedure, timetable, enforcement, grounds of challenge, benefits, risks and costs

What is adjudication? You have asked us to set out what adjudication involves and how the process commonly unfolds, in the context of [ [ your proposal to enter into a construction contract with ] [ insert name of the counterparty ] OR [ in anticipation of adjudication proceedings between ] you and [ insert name of the counterparty ] ]. Adjudication is a mechanism intended to help parties resolve disputes quickly and at relatively modest cost. Pursuant to the Housing Grants, Construction and Regeneration Act 1996 (HGCRA 1996), parties to construction contracts have the right to commence adjudication at any time. The dispute is referred to an adjudicator, who acts as an independent decision-maker. In most cases the adjudicator will be a construction industry professional (e.g. a quantity surveyor or engineer), or a lawyer with construction experience. They will consider the arguments advanced by both parties, and may draw on their own initiative and expertise, before reaching a decision on how the dispute should be determined. The party...

Read More Right Arrow

View the related Q&As about Lock-out mechanism

Q&As
Equal pay: genuine material factor defence - client‑funded bonus

The Equality Act 2010 (EqA 2010) The Equality Act 2010 (EqA 2010) sets out measures to secure equality between men and women in pay and other employment terms where an employee’s work matches that of a comparator of the opposite sex. It accomplishes this by implying a sex equality clause into the employee’s contract of employment, ensuring that the contract reflects the comparator’s terms. This mechanism is intended to guarantee parity of conditions between the employee and their comparator...

Read More Right Arrow
Q&As
Lease Forfeiture: 3 Months' Arrears, Tenancy Deposit Use and Deductions

Forfeiture Forfeiture is a contractual mechanism that permits a landlord to terminate a tenancy when the tenant breaches the tenancy terms. This can be achieved either by peaceable re-entry to the property or by starting court proceedings. The tenant retains the ability to seek relief from forfeiture. This Q&A does not clarify whether the lease in question is commercial or residential. For commercial lettings, a landlord cannot exercise forfeiture without first serving a notice under section 146 of the Law of Property Act 1925, setting out the breach and requiring the tenant to remedy it. However, no section 146 notice...

Read More Right Arrow
Q&As
Twice-widowed: £325k PET impact on £650k TNRB within 7 years

If an individual does not exhaust their inheritance tax nil rate band (NRB) on death—perhaps because a large share of the estate passes to a surviving spouse or civil partner—the Inheritance Tax Act 1984, sections 8A to 8C, sets out provisions allowing the unused NRB, wholly or partly, to be transferred and applied to increase the survivor’s NRB when that person dies. The mechanism preserves a proportion of the first estate’s NRB, which can then uplift the allowance available to the surviving spouse or civil partner on their death. The uplift is determined by a statutory calculation in IHTA 1984, section 8A(3) and (4)...

Read More Right Arrow