London Underground drivers are to stage a series of 24-hour strikes in a dispute over working arrangements, the Rail, Maritime and Transport (RMT) union has announced.

A series of walkouts will begin on 26 November, in opposition to plans to introduce a voluntary four-day working week.

Further strikes are planned for 17 December, 19 December, 4 January, 6 January, 17 February, 23 February and 25 February.

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