More 24-hour rail services in London have been announced as part of measures the Government said will create half a million jobs and add £6.4 billion to the capital's economy.

Chancellor George Osborne and mayor Boris Johnson said 24-hour services will be expanded on the Tube and extended to London Overground and the Docklands Light Railway.

After an early-morning visit to London Underground to view maintenance work being carried out, they outlined a six-point plan including 24-hour London Overground services in 2017, all-night services on the Docklands Light Railway by 2021, and an expansion of 24-hour Tube services, as well as extended wi-fi on the Tube.

Rail unions described the announcement as a "blatant pre-election stunt" and queried how the £6.4 billion had been worked out.

Night-time Tube services will be expanded to the Metropolitan, Circle, District, and Hammersmith and City lines once Transport for London's modernisation programmes are completed.

Currently 24-hour services will begin on the Northern, Victoria, Piccadilly, Jubilee and Central lines from September.

The Government said it will provide £10 billion of funding for investment in new Transport for London infrastructure over the next parliament.

Mr Johnson also confirmed plans for 200 more Routemaster buses this year and commited to 800 new buses a year from next year onwards, securing jobs in Ballymena and Falkirk, where 90% of TfL's buses are manufactured.

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Mr Osborne said: "We are today committing to provide London with £10 billion for new transport improvements.

"We live in a 24-hour city, and the mayor is going to set out how our plan will deliver a 24-hour Tube operation to support it.

"I am also asking the mayor to think big about the capital's long-term needs.

"I want these plans and others worked up, properly costed and prioritised so we can make a decision to go ahead in the Government's spending round this summer."

Mr Johnson said: "As London's population continues to grow, it is investments in infrastructure such as this which will ensure that the capital remains competitive and the best big city to live in."

Mick Cash, leader of the Rail, Maritime and Transport (RMT) union, said: "This announcement has been dropped on London by the mayor as a blatant pre-election stunt without a shred of consultation with the union.

"That is a ridiculous way to conduct important negotiations and to unveil major service developments.

"RMT is not opposed to extended running but there are massive issues on staffing, safety and maintenance which have not been addressed and which would need to be signed off by our reps.

"This announcement has been made against the backdrop of a near doubling in assaults on staff, cuts to over 1,000 jobs and the axing of guards on London Overground.

"Night running would mean increased drunkenness and risks to both passengers and staff alike and could only work with substantial increases in staffing right across the board, and that means an immediate reversal of the current cuts programme."

Manuel Cortes, leader of the TSSA rail union, said: "Boris Johnson's publicity stunts are getting more and more desperate and deluded as he heads for the exit door at City Hall to become an MP on May 7 for Uxbridge.

"How he and George Osborne think they can dream up policies in Tory Central Office for the next Labour mayor to follow when he or she is elected next year is beyond me.

"His night Tube starting in September will lose millions and is not due to break even for another 18 years, and yet here he is, with another back-of-a-fag-packet publicity stunt."