That leaves a question as to whether Treasury officials expressed their concern about Barclays' high LIBOR rates in their conversations with the Bank of England.

BBC: Barclays Banks - A Whitehall whodunit

The Bank of England's Financial Stability Review shows that Barclays' retail banking loans in Spain, Italy and bailed-out Portugal are equivalent to a bit more than its core equity capital - its buffer against losses.

BBC: Downgraded UK banks, bonuses and Bank of England support

As you know, I am particularly interested to hear what he will say about a secret conversation he held in the autumn of 2008 with Paul Tucker, deputy governor of the Bank of England - and whether he felt Mr Tucker was in anyway encouraging Barclays to understate its borrowing costs.

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The former Chancellor Alastair Darling has expressed astonishment that anyone in the Bank of England or the Treasury would have been stupid enough to tell Barclays to rig the rate.

BBC: Barclays Banks - A Whitehall whodunit

The chief executive of Barclays, Bob Diamond, claims that the Deputy Governor of the Bank of England, Paul Tucker, had flagged concerns from senior figures in Whitehall over why Barclays was always towards the top end of Libor pricing.

BBC: Lord Myners: 'I didn't speak to anybody about Libor'