A report by the Resolution Foundation will fuel demands from Labour MPs for the chancellor to find another £3.5bn to tackle end the two child benefit cap Sign up to our free Brexit newsletter for our analysis of the continuing impact of Brexit on the UK Sign up to our free newsletter for the latest analysis on Brexit's impact Sign up to our free newsletter for the latest analysis on Brexit's impact Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent.