The RMT Union has confirmed that strike action will go ahead every weekend on the Night Tube from today till June 19.
Transport for London (TfL) has warned of severe disruption on the Victoria and Central lines from 7pm this Friday and Saturday, and every weekend through to the summer.
Night services on the London Overground will however run as planned between Highbury & Islington and New Cross Gate.
RMT drivers are striking over the return of the Night Tube, which was brought back at the end of November.
The union says that TfL should hire additional drivers to cover overnight shifts on the weekend, while the transport body has said that they will only have to work four night-shift weekends per year, and can swap shifts.
TfL have asked the union to join in for further talks to help solve the dispute.
What is RMT saying?
RMT general secretary Mick Lynch said: "As the New Year gets under way our battle for workplace justice for tube staff steps up a gear with a new phase of action running from tomorrow through to the summer.
“If London Underground and the mayor thought this fight for progressive and family friendly working practices was going away they need to think again.
“It’s the failure of LU and Sadiq Khan to address the grievances at the heart of the dispute that leaves us no option but to confirm the programme of action goes ahead as planned. .
“RMT has repeatedly put forward cost neutral proposals that would repair the damage unleashed by deleting 200 driver posts and which would dig LU out of this mess.
“They have ignored us and that approach will have severe consequences for Londoners through to the summer.
“We remain available for further talks.”
What is TfL saying?
Andy Lord, managing director of London Underground, said: “We’re disappointed that, once again, the RMT is continuing to push for strike action that is likely to cause further unnecessary disruption.
“We’re calling on the RMT to join us for talks so we can work together to resolve this dispute around roster changes, which mean no job losses and greater flexibility for drivers.
“If these six months of action do go ahead, we will continue to operate as regular a service as possible.
“However, customers are advised to check before they travel and use buses to complete their journeys where required.
“I apologise to them for the impact this unnecessary action will have on their journeys.”
Northern Line Bank branch closure
The section between Kennington and Moorgate will be closed for 17 weeks from January 15 to mid-May.
This is to finalise work on the new Northern Line tunnel and to finish the £700 million upgrade of Bank Station.
There will also be a reduced service between Camden Town and Moorgate during this period.
A temporary new bus route will also be introduced on weekdays.
This will be the 733 from Oval into the City, which will run every seven to eight minutes