Mayor of London Boris Johnson announced today that the Docklands Light Railway, London Overground and most Tube lines will be included within 24-hour rail services plans.

Night-time services will be extended to the Metropolitan, Circle, District, and Hammersmith & City lines by 2021. The London Overground will join the 24-hour culture in 2017 and the DLR in 2021.

From September 24-hour weekend services are due to begin on the Jubilee, Northern, Piccadilly, Victoria and Central lines.

The Mayor of London was joined by Chancellor George Osborne at Victoria underground station where they spoke about the additional 24-hour services as part of £10bn investment to Transport For London's roads, buses and the Tube network.

The pair were at the station to watch overnight engineering works early this morning.

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.

"Today we have committed to additional night Tube services, the first 24-hour London Overground and the purchase of hundreds of brand new buses.

"This, combined with the promise of future investment in projects such as Crossrail 2 and the Bakerloo Line extension, will ensure we keep the capital's economy moving well into the 21st century."

The Rail, Maritime and Transport (RMT) union had concerns over a 24-hour rail network however, with leader Mick Cash saying the extension of hours could increase "dunkenness and risks to both passengers and staff".