DUP and Sinn Féin say the Northern Ireland budget cannot afford the compensation scheme.Read more
BBC News Parliaments
BBC NI Agriculture & Environment Correspondent
A government official raises doubts about the future of the contract - on which millions of pounds of taxpayers money has already been spent.Read more
The cost of repairing the Elizabeth Tower, which houses the famous Big Ben bell, has risen by £18.6m following the discovery of bomb damage and asbestos.
The need for more money was only discovered during a survey of the 177-year-old structure in central London.
The House of Commons Commission said it was "extremely disappointed" that the cost had risen to £79.7m.
The new budget will have to be approved by the accounting officers of the Houses of Parliament.