This on MuchAdo2011:
Drivers belonging to the RMT will strike between 0901 BST on 19 June and 0300 BST on 20 June, between 0901 BST on 27 June and 1159 BST on 28 June, between noon on 29 June and 1159 BST on 30 June and between noon and 2100 BST on 1 July.
These strikes have been suspended, no?