Allen & Overy (A&O) is in line to pick up a high-profile advisory role if the Government pushes ahead with plans to introduce 100-year sovereign bonds to take advantage of Britain’s historically low interest rates.

The magic circle firm is currently the primary adviser on this type of work to the Debt Management Office (DMO), which would be charged with testing market appetite for the new gilts, which are expected to form part of Chancellor George Osborne’s annual budget next Wednesday (21 March).