Transport bosses vowed today to run a good service during Saturday's tube strike with 'minimal disruption'.
Drivers belonging to the RMT union are due to walkout at 9.30pm in a dispute over a sacked colleague.
Alec McGuigan was dismissed after failing a breath test at the Northern Line depot in Morden.
The strike is due to end shortly before 4am on Sunday morning. The RMT said it would be the start of a 'rolling programme' of industrial action.
But London Underground said it expected to run a good service with a 'small chance' of disruption on some lines.