Has the Government's failure to buy new trains for Thameslink put the entire upgrade of the multi-billion pound route at risk?
The Government was supposed to sign a contract for the trains three years ago.
Today the National Audit Office condemned that delay, saying it could mean the vital improvements to the route delay wont be ready by the deadline of 2018.
Political Correspondent Simon Harris reports.
More top news
Donald Trump is to visit the UK on July 13 and hold bilateral talks with Theresa May, Britain's ambassador to the US has said.
The Football Association has announced it has received an offer to buy Wembley Stadium.
The most hotly-tipped date is July 13, following the Nato summit which the president is due to attend in Brussels on the previous days.