This committee, of ancient origin (it existed long before the current system of departmental select committees was established), is back in the news. Its active Chair, Margaret Hodge, has announced that it will be asking the tax authority, HMRC and the Treasury, about the HSBC scandal when the committee takes evidence from them about other tax avoidance schemes tomorrow. http://www.bbc.co.uk/programmes/p02jlzr9 and http://www.cityam.com/208991/hmrc-faces-hsbc-tax-dodge-grilling-parliament.
The committee website can be found at http://www.parliament.uk/business/committees/committees-archive/committee-of-public-accounts/
