Tube strikes are set to cause severe disruption on Central and Victoria line Night Tube services from this weekend.
Both the Victoria and Central lines could be severely disrupted from 7pm onwards on Fridays and Saturdays from this weekend through to June 19.
Customers are advised to check before they travel and use buses to complete their journeys where required.
RMT is instigating walkouts over new rosters, which have been agreed by the other recognised union and were introduced for Tube drivers in August.
Night Tube services were re-introduced on the Central and Victoria lines on Saturday November 27.
The impact of the overnight strike action depends on the number of drivers booking on each weekend, so customers are advised to check before they travel on Night Tube services for the most up-to-date information.
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.”