http://www.bbc.co.uk/news/uk-england-london-35283623

"London Underground staff are to stage three 24-hour strikes and other
industrial action over pay and night Tubes.

The strikes by RMT, Aslef and Unite union members will start on the
evenings of 26 January, 15 February and 17 February."

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Seems like LU have a bad case of the night Tubes...