Unions representing London Underground workers have sensationally called off a mammoth double tube strike just 24 hours before it was set to begin.

An announcement was made by Unite at 5pm on Monday, August 24 after feverish negotiations between three unions RMT, TSSA and Unite, and Transport for London. Aslef, which represents tube drivers, was not set to take part in the strike.

Each strike was set to last 24 hours, starting from the evenings of Tuesday, August 25 and Thursday, August 27, with commuters on the underground advised to expect disruptions right through from Tuesday to Friday evening.

It would have been the third Tube strike this summer, with the network grinding to a standstill in August and earlier in July. The strikes have not affected Docklands Light Railway or London Overground services.