Barclays urge Diamond not to take full £17million payoff The Financial Services Authority and US regulatory authorities recently fined Barclays £290 million. Further fines are expected for other banks. The Sunday Telegraph has also learned MPs probing the scandal want to question Baroness Vadera, the former Labour minister and close ally of Gordon Brown. Members of the Treasury select committee now see the economist and investment banker as "more of a priority" than Ed Balls, the shadow chancellor. "She was there at the department at the time - Ed [Balls] was not," a member of the committee said of the Baroness. I think we know she is a woman with a reputation for getting want she wants. There are many people to call but she is towards the very top of that list. Baroness Vadera was considered the woman in government Mr Brown trusted more than any other. A spokesman for Baroness Vadera, who served as a small-business and international development minister, said this weekend that she had not yet been asked to appear as a witness before the Treasury Select Committee. "Shriti Vadera has never discussed the price setting of Libor with any bank at any time in any form of communication," he said. She has never had any inappropriate discussions on Libor with anyone at all. It is unclear when Lady Vadera may face the committee, which could hold a number of more hearings before parliament's summer recess begins on July 17. Lady Vadera was invloved in a note written by investment bank UBS for the Treasury in 2008 headed "Reducing Libor." The peer has made it clear that it was a clear policy position widely supported across the political spectru. A legitimate reduction in Libor would have meant cheaper lending to businesses. George Osborne, the Chancellor, cited the note in a fiery commons debate on the Libor scandal last week, and said it put pressure on Lady Vadera and other Labour figures to explain their role at a time when Barclays had deliberately understated submissions to the Libor setting mechanism in a bid to make itself look stronger. "The access of credit at an appropriate price during the financial crisis and even now was a concern of the previous government," Lady Vadera said last week. That is not the same thing as somebody manipulating something in the market inappropriately. Tomorrow the committee is to interview Paul Tucker, the Bank of England deputy governor, after Barclays published documents that said that "senior Whitehall figures" had been asking about the bank's Libor estimates and suggested that the bank's submissions did not need to be as high as they appeared. A senior Whitehall source said: "We are not expecting much fireworks from Tucker's hearing - it is though he has a pretty clear explanation for what he did." The following day the committee will interview Marcus Agius, the Barclays chairman, who resigned last weekend, but will now remain in boost until the bank appoints a new chief executive. This week the Government will start to set up the joint parliamentary committee which will investigate the Libor scandal. One senior Whitehall source said that establishing the committee is proving "extremely difficult." "Everybody seems to think they should be on it," the official said. There are disagreements about its scope and it remit, what the split between MPs and peers should be - everything. The joint committee is to be led by Andrew Tyrie, a respected Conservative MP who currently chairs the Treasury Select Committee. His report is expected to be published by the end of the year.