Sir Tom McKillop, who quit as chairman of Royal Bank of Scotland today nearly three months sooner than planned, is expected to keep next week's appointment to appear before a powerful UK parliamentary committee which will quiz bank chiefs on the financial crisis.

RBS, whose chief executive Sir Fred Goodwin stepped down in November as the bank announced details of a capital raising from the UK Government, had revealed at the same time that McKillop would leave the chairman role at its annual general meeting on April 29.