The whole London Underground network will be "substantially disrupted" next week by a planned strike by train drivers, passengers have been warned.
Members of the Aslef union are set to walk out for 24 hours on Thursday October 5 in a dispute over working conditions.
Nigel Holness, director of network operations for London Underground, said: "Should the planned strike action go ahead, there will be substantial disruption.
"We will do everything possible to ensure customers can get around on alternative transport services and have the right information to help them do this.
"We are committed to ensuring that our employees are able to maintain a good balance between their work and personal lives and we have been working closely with the unions on new ways to achieve this.
"I encourage the Aslef leadership to continue working ?with us constructively? rather than moving towards unnecessary strike action."