London Underground drivers have confirmed they will stage another 24-hour strike in a dispute over the new all-night Tube timetable.
Members of Aslef will walk out at 9.30pm (1009 AEST) on August 5, threatening fresh disruption to services.
The decision, by the union's executive, came as both sides in the dispute were invited to hold fresh talks in a bid to avert a repeat of last week's stoppage.
Members of four trade unions staged a 24 hour strike from last Wednesday evening, which crippled services until Friday morning.
A spokesman for the conciliation service Acas said, "Acas has written to London Underground, Aslef, RMT, TSSA and Unite, inviting them to attend exploratory talks tomorrow morning."
Unions are unhappy about pay and rosters for the new service, which is due to start on September 12.
The RMT, TSSA and Unite have yet to announce their next move on the industrial action front.
