Delays in awarding the contract to build the trains for the Government's Thameslink upgrade may have put the project in jeopardy, a public spending watchdog says.
The National Audit Office (NAO) says the delays cast doubt on the government's ability to deliver a major upgrade of the key rail route by the 2018 deadline.
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More than a tenth of the Piccadilly Line train fleet is out of action because of emergency repairs to damaged wheels.
Rows of students stood and turned their backs before filing out of the lecture theatre.
Effie the endangered Western lowland gorilla has given birth to a healthy baby boy at London Zoo.