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London's all-night Tube service could begin this August, according to reports.

A definitive start date has not yet been announced, however it is understood Transport for London (TfL) has drawn up plans to introduce it by the summer.

The launch of the service will be staggered. At first passengers will be able to travel at night on Fridays and Saturdays on the Victoria and Jubilee Lines in August.

It will then be introduced on the Central, Northern and Piccadilly Lines in September, it is believed.

The two biggest unions, the RMT and Aslef, recently accepted a pay deal offered by TfL.

The TSSA union and Unite have not yet accepted the offer.

Tfl is forging ahead with plans to begin the service in August, it is understood.

It was originally supposed to begin in September last year.

A TfL spokesman said: "No date has yet been agreed for the launch of the night Tube, but we are working hard to deliver it for London as quickly as possible."

The RMT is balloting engineers for strikes over the planned new service. An earlier ballot of other RMT members returned a huge vote in favour of a pay deal.