
The Piccadilly line was hit by 15-minute gaps between services on Tuesday, but this was just the latest instance in a catalogue of delays.
Latest TfL data, for the four weeks to February 5, shows only 86.8 per cent of weekday trains running. Only the Jubilee line was less reliable out of the 11 Underground lines. At peak times, Piccadilly line trains only operated on 85.7 per cent of scheduled mileage.