Commuters facing another round of tube strikes were offered a glimmer of hope today when the powerful drivers' union refused to take part.
Aslef said its members would not join fellow workers from RMT, TSSA and Unite in two 24-hour walkouts later this month.
The move came amid growing speculation about a possible postponement of the launch of Boris Johnson's flagship Night Tube.
Sources suggested London Underground might drop the September launch date in a bid to take the heat out of the dispute.
Aslef's decision followed fresh talks at the conciliation service ACAS. Union officials wanted a written guarantee about Night Tube rosters and a delay to the September launch.
LU insisted it was still operationally ready to start the 24-hour service on September 12th, although 'not at any cost'.