Earlier the Iranian Ambassador met at the Foreign Office with the FCO's top civil servant and permanent under secretary, Peter Ricketts, to discuss the situation.

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At the Public Accounts Committee there's a hearing (at 3.15pm) on reforming the Ministry of Defence, with evidence from Ursula Brennan, the Permanent Under-Secretary, and senior MoD mandarins.

BBC: Week ahead in Parliament

Only Sir John Chilcot, who retired as permanent under-secretary of the Northern Ireland office on the day the commission was announced, is not on record with a view.

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Sir John Chilcot, 70, is a former permanent under-secretary of state at the Northern Ireland Office and has been chairman since 2001 of the Police Foundation and sat on the Butler Inquiry into the intelligence on Iraq's weapons of mass destruction.

BBC: Iraq war inquiry to be in private