London Underground workers will be joined by their colleagues at Transport for London (TfL) in staging industrial action this month, it was announced yesterday.

Members of the Rail, Maritime and Transport (RMT) union on the capital’s subterranean train network will walk out from 9pm on Monday April 28 for two days and again from 9pm on Monday May 5 for three days over ticket office closures.

The union claimed that long-running talks hosted by conciliation service Acas aimed at settling the dispute were “wrecked by a combination of management intransigence and the introduction of additional measures” which made the original plans even worse.