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***Update 18/5/26 - Strikes scheduled for May 19-22 those scheduled for June 16 and 18 have been called off. New strike dates are now scheduled for Tuesday 2 June and Thursday 4 June.*** A series of six 24-hour strikes by drivers on the London Underground has been announced. So what are the strikes about? What disruption is expected and when? And will the strikes be called off? Ross Ryan has more. (Image credit: Getty Images)