London's Night Tube service on the Piccadilly line will begin on December 16, it has been announced.

Sadiq Khan, the London Mayor, said the decision fulfilled his pledge to have five lines running throughout the night on Fridays and Saturdays by the end of the year.

All-night services have already begun on the Victoria, Central and Jubilee lines, with the Northern line to begin on November 18.

The 24-hour weekend Piccadilly line service will run between Cockfosters and Heathrow Terminal 5.

It will mean that late-night revellers will be able to travel home from Christmas parties by the Piccadilly line this year.