The RMT has confirmed three planned days of strike action for the coming weeks, with drivers' union Aslef expected to confirm dates shortly (they'll be the same dates).
These strikes are about the ongoing dispute over working conditions for the much-delayed night tube and the 2015 pay settlement. Aslef's Finn Brennan said:
Taking strike action is never something that is decided lightly. Our members lose pay and we genuinely do not want to be in a position where disruption is caused to the travelling public. But for the last two months, management have refused to engage in talks with us.
Conservative mayoral candidate Zac Goldsmith accused the unions of playing "political games" and warned "we can expect four years of these games and gridlock if Sadiq Khan and his union paymasters get their way". However, Khan's campaign pointed out there have been 35 tube strikes under eight years of Boris Johnson, as opposed to 16 strikes under Ken Livingstone's mayoralty.
Strike dates are currently set as:
- Evening of 26 January for 24 hours
- Evening of 15 February for 24 hours
- Evening of 17 February for 24 hours
