Working Group on Sterling Risk-Free Reference Rates

A working group of market participants formed to catalyse the transition from the interest rate benchmark LIBOR towards SONIA in sterling markets.
*synthetic JPY LIBOR will cease at the end of 2022. Availability of synthetic GBP LIBOR is not guaranteed beyond end-2022.


The industry-led Working Group on Sterling Risk-Free Reference Rates (the Working Group) is supporting the transition from LIBOR to SONIA (Sterling Overnight Index Average) in sterling markets.

The Working Group is formed of a diverse group of market participants and trade associations representing relevant sectors and markets. It is chaired by Tushar Morzaria (Barclays).  The Bank of England and the Financial Conduct Authority (FCA) participate as ex-officio members and provide administrative support to the group.

You can read its:

The Working Group also benefits from strategic support and senior engagement with firms through a Senior Advisory Group. You can read its terms of reference.

Please note that views and outputs of the Working Group do not constitute guidance or legal advice from, and are not necessarily endorsed by, the Bank of England (including the Prudential Regulation Authority (PRA)) or the FCA.

Latest Working Group announcements and publications

December 2021

Update on contract continuity legislation to support the wind-down of critical benchmarks

On 15 December, the Critical Benchmarks (References and Administrators’ Liability) Act received royal assent and became law. The Act provides legal certainty as to how contractual references to a critical benchmark should be treated once the FCA provides for that benchmark to be published with a changed methodology. The Chair of the Working Group previously wrote to HM Treasury, seeking an update on the Government’s approach to safe harbour provisions following its earlier consultation. In May, the Economic Secretary to the Treasury, John Glen, responded confirming the Government’s plans to bring forward further legislation.

Statement encouraging continued focus ahead of end-2021

The Working Group published a statement urging the continued focus of market participants ahead of the cessation of most LIBOR panels at end-2021. The Working Group encourages firms to: use SONIA linked contracts, where appropriate, for all new business; continue to pursue active transition, where feasible, and; ensure readiness for upcoming operational events. Further, we highlight recent regulatory guidance on ceasing new use of USD LIBOR by end-2021, with some limited exceptions. 


July 2021

Active transition of legacy GBP LIBOR loan contracts – Timelines and considerations for borrowers

The Working Group published a paper to assist borrowers in understanding and achieving the end-Q3 milestone for active transition of legacy GBP LIBOR loans. The Working Group encourages timely engagement with relevant parties and the preparations needed to ensure readiness for the recommended milestone on active transition. 

May 2021

Recommendation of Successor Rate for fallbacks in bond documentation referencing GBP LIBOR

The Working Group published a statement recommending the use of overnight SONIA, compounded in arrears, as the successor rate recommended to replace GBP LIBOR for the purposes of the operation of fallbacks in bond documentation that envisage the selection of a recommended successor rate. 

April 2021

Active transition of legacy GBP LIBOR contracts & operational considerations for fallbacks in uncleared linear derivatives

The Working Group published a statement setting out a range of considerations to help market participants, across GBP bond, loan and derivative markets, assess and prioritise the active transition of legacy GBP LIBOR contracts to SONIA. For derivative market participants who may rely on ISDA’s IBOR fallbacks, the Working Group has also published a paper providing infrastructure and operational considerations to inform their planning and preparation for the operationalisation of fallbacks in non-cleared linear GBP LIBOR derivatives. The statement and paper are intended to assist market participants in understanding and balancing the benefits, costs and risks of active transition and reliance on fallbacks in relation to their own circumstances.

Supporting transition from LIBOR in sterling structured products

The Working Group published a paper considering how a sterling structured products market could be designed using compounded in arrears SONIA, and to support the transition of legacy structured products where GBP LIBOR is in use. As many structured products are pre-packaged structured finance investments with a derivative component, the paper builds on the work to date on transition in areas relating to the bond market and derivatives market. It is intended to support issuers, manufacturers, distributors and investors in their plans to meet the Working Group’s milestones set out in its roadmap and priorities for transition by end-2021.

March 2021

Working Group publishes summary of responses to its consultation on successor rate to GBP LIBOR in legacy bonds referencing GBP LIBOR

The consultation was open from 2 February 2021 until 16 March 2021 and attracted 24 responses from a range of market participants. This paper summarises the responses received. The Working Group will discuss these results at its forthcoming meetings, including consideration of potential next steps to help catalyse further transition in sterling bond markets based on this feedback.

Working Group welcomes proposed market standard on use of Term SONIA

Alongside the Bank of England and the FCA, the Working Group welcomed a proposed market standard on the use of Term SONIA reference rates, published by the FICC Markets Standards Board. We have encouraged widespread adoption of SONIA compounded in arrears in derivative markets in particular, keeping use of Term SONIA limited to specific use cases primarily in cash markets, to provide the most robust foundations for sterling interest rate markets.

Working Group welcomes announcements on the end of LIBOR

The Working Group welcomes announcements made by the FCA and ICE Benchmark Administration (IBA) confirming cessation dates for panel bank LIBOR, and a related statement by ISDA confirming the fixing of the ‘spread adjustments’ to be used in its IBOR fallbacks. With limited time remaining, the Working Group encourages firms to execute their transition plans rapidly and ensure they are ready for the end of GBP LIBOR ahead of the end of 2021.

Working Group papers by category 

Working Group background

The Working Group was originally set up in 2015 in response to the Financial Stability Board's recommendation Opens in a new window to develop and adopt robust risk-free rates (RFRs) to provide an alternative to LIBOR-style reference rates.

In 2017, the Working Group published a white paper: SONIA as the risk-free rate and approaches to adoption Opens in a new window. This paper proposed SONIA as the preferred alternative rate for sterling markets and sought feedback on the best approach to its adoption. It hosted an industry roundtable, which confirmed strong support for SONIA Opens in a new window as the preferred sterling risk-free rate.

In view of concerns about the sustainability of LIBOR beyond the end of 2021, the Working Group was reconstituted at the start of 2018 with an extended mandate and broader participation, focusing on catalysing a transition to using SONIA as the primary sterling interest rate across bond, loan and derivatives markets by the end of 2021.

You can keep up to date by signing up for the Working Group’s monthly newsletter and following the Working Group LinkedIn page Opens in a new window.


The membership of the Working Group includes banks and dealers, investment managers, non-financial corporates and other sterling issuers, infrastructure firms and trade associations.

We have published the full list of member firms Opens in a new window Opens in a new window and membership selection criteria Opens in a new window Opens in a new window.

The Working Group invites further expressions of interest in participating in transition work either as members of technical sub-groups or market sector forums to share views on aspects of the transition.

This includes expressions of interest from professional services firms, in particular accountancy firms, law firms and financial consultancies where the work would be on a pro bono basis to provide expert input to the working group and related sub-groups.

For more details, or to express an interest in participating in any of the Working Group’s work, please contact

This page was last updated 11 January 2022

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