Email cache shows depth of Whitehall fears over Barclays Libor submissions Among the emails were communications between Mr Tucker, Mr Diamond, and former Barclays chief executive, John Varley, who ran the bank at the time in question. An email released last week by Barclays showed a "file note" taken by Mr Diamond following a conversation with Mr Tucker on October 29, 2008, that was sent to Mr Varley and senior Barclays investment banker, Jerry del Missier. A statement released by Barclays said that Mr del Missier had seen the note as an instruction for the bank to lower its Libor submission in response to the concerns of senior Whitehall officials. Mr del Missier resigned hours after Mr Diamond last week as the outcry over the Libor rigging scandal continued to grow. Mr Diamond has said he did not intend his note to be an instruction to lower Libor submissions and said he did not think Mr Tucker had meant his comments to be interpreted that way either. The emails will add to the pressure on Mr Tucker to answer questions over how much he knew about Libor rigging. Specifically, he is expected to be quizzed about a meeting he chaired of the Bank's Sterling Money Markets Liaison Group in November 2007, at which several members warned they "thought that Libor fixings had been lower than actual traded inter-bank rates through the period of stress." TSC sources on Sunday said Mr Tucker must have known that Royal Bank of Scotland and Lloyds Banking Group were posting false rates because their Libor submissions were lower than Barclays even after they had been locked out of markets and forced to take £60bn in secret loans from the Bank.