Transport unions RMT and the Transport Salaried Staffs’ Association (TSSA) yesterday confirmed dates for a series of 24-hour strikes to be launched by 10,000 London Underground staff in what will bring severe disruption to London’s commuters. The unions said the first staff walk out will start at 5pm on 6 September, with similar action planned for 3 October, 2 November and 28 November. The dispute between the unions and London Underground is over plans to axe up to 800 jobs. London Underground urged union leaders Bob Crow and Gerry Doherty to call off the strike, which is expected to cost the city up to £48m a day. RMT said yesterday that London Underground has failed to answer requests to meet with Acas, the conciliation service provider.