A London Assembly Member has called on Sadiq Khan to reveal exactly what issue was identified on the new Piccadilly line ...

New air-conditioned Piccadilly line trains tested in central London - The first deep-level air conditioned trains have been tested following significant delays ...

The Piccadilly line connects King’s Cross and the West End with Heathrow airport and beyond and is used for more than 10 per cent of all daily Tube journeys – about 160m trips a year.

The rollout of new Piccadilly line trains has been pushed back by up to a year while the network tries to tackle the “complex” introduction of the modern fleet on a 120-year-old Tube railway.