 Carillion directors, trustees of the company's pension scheme, and the Financial Reporting Council were summoned to appear before the House of Commons Business and Work and Pensions Select Committees on 30 January and 6 February.Directors were also summoned before the Public Accounts Committee on 27 February 2018.The Business and Work and Pensions Select Committees also wrote to the 'Big 4' firms, KPMG, EY, PwC and Deloitte, asking for detailed accounts of services offered to Carillion, its subsidiaries and pension scheme since 2008, and what fees were received.