A 48-hour Tube strike is set to disrupt travellers and commuters as London Underground workers prepare to walk out in a row over plans to close ticket offices.
Rail, Maritime and Transport union members plan to stage a walk-out at 9pm tonight, returning to work at one minute to 9pm on Wednesday.
Disruption to the service could begin before the official walk-out and continue until Thursday morning.
Transport for London has issued a document of travel advice to customers and said it plans to run as many services as possible with extra bus and river services.
The RMT has warned that if the dispute is not resolved a second, 72-hour strike, is planned to begin at 9pm on 5 May.
The union and LU have met more than 40 times through the conciliatory service ACAS since the last 48-hour strike in February.
