The current membership of the Treasury select committee, which will be replaced following the general election, recommended that their successors investigate the issue.

The liquidity auctions, which took place in 2007 and 2008, were designed to allow banks to access additional cash at the height of the credit crunch .

Last night MPs suggested the TSC examines why the Bank of England itself appointed a barrister, Lord Grabiner QC, to undertake an internal investigation into possible rigging of the auctions, and why the case was subsequently passed to the Serious Fraud Office earlier this year.

According to the FT, the committee’s note said: “There is merit in the Treasury committee in the next parliament drawing upon the evidence already collected, examining further a number of issues arising from Lord Grabiner’s investigations for the Bank of England into the foreign exchange market and the conduct of liquidity auctions.”

It added that a key question surrounded whether the bank made “appropriate decisions about public disclosures of the SFO’s work”.

It remains unclear which elements of the auctions the SFO is investigating, or whether any Bank employees are under individual suspicion.