The RMT union has planned a series of strikes starting on Friday 26 November, and also coinciding with the resumption of the Night Tube.
After 21 months with no service, the night tube is due to restart service on the Central and Victoria lines on Saturday 27 November.
However, the RMT Union has instructed its members not book on for shifts on those lines, along with strike action on other days. Here are the times as they stand. Note, these have been updated since action was first announced:
4:30am 26 November–4:29am 27 November (Central, Jubilee, Northern, Piccadilly & Victoria)
8:30pm 27 November–4:29am 28 November (Central & Victoria)
8:30pm 3 December – 4:29am 4 December (Central & Victoria)
8:30pm 4 December – 4:29am 5 December (Central & Victoria)
8:30pm 10 December – 4:29am 11 December (Central & Victoria)
8:30pm 11 December – 4:29am 12 December (Central & Victoria)
8:30pm 17 December – 4:29am 18 December (Central & Victoria)
4:30am 18 December – 4:29am 19 December (Central, Jubilee, Northern, Piccadilly & Victoria)
That affects the first four weekends of the night tube's resumed service, at a time when it's expected to be very busy due to Christmas party season.
The RMT cites the "imposition of unacceptable and intolerable demands on staff" which will "wreck work life balance by bulldozing through additional night and weekend working" as the cause for the strike action. However, their proposed action will trouble safety campaigners who have been asking for the night tube to return for some time, to provide vulnerable Londoners with a safe way to get around the city at night.
The RMT and TfL have been engaged in 'constructive' talks, but as things stand the strikes appear to be going ahead. We will update this article with any further information as we get it. Meanwhile, Tom Edwards of the BBC offers more insight into the background to the proposed strikes.