A signal failure caused commuter chaos this morning, with trains between Amersham and Chalfont & Latimer on the Metropolitan line cancelled.

There were also minor delays between Chesham/Watford and Uxbridge to Harrow-on-the-Hill due to the signal failure at Harrow-on-the-Hill.

The Met line’s Twitter account said there was no service between Amersham and Chalfont & Latimer at around 9.30am, with service resuming with severe delays at 10.02am.

Train services were delayed on the entire line as a result, with Transport for London advising travellers to leave extra time for journeys.