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18 June 2015, 19:15 | Updated: 18 June 2015, 19:18
Tube drivers are going to go on strike for 24 hours over the new all-night Tube services coming in September.
Union leaders have warned the action will shut down the entire network.
Members of Aslef will walk out from 21.30 on Wednesday 8 July 2015, with further strike dates expected to be announced.
The move followed a vote in favour of industrial action by 97% in a turnout of 81%.
The union says it is not opposed to the new weekend night Tube due to start in September but it is in dispute over pay.
Two other unions - the RMT and TSSA - are also balloting their members for strikes, with the results due later in the month.
Aslef said LU was trying to force through new rosters which would mean Tube drivers will have to work an unlimited number of weekend and night shifts for no extra pay.
Finn Brennan, Aslef's district organiser, said: "There is a window of opportunity for London Underground managers to avoid a summer of disruption by seriously engaging with us to find a solution. They need to withdraw the threat to impose new rosters and make a realistic offer on pay and conditions.
"We are always prepared to talk, but they have to start listening to this very clear message from their staff.
"Our members are entitled to a family life and to some sort of work/life balance.
"We aren't opposed to all-night services but we want them introduced in a fair and sensible way which rewards staff for their hard work and the contribution they make to the success of the London Underground."
The strike would hit the travel plans of tennis fans going to the second week of Wimbledon. July 8 is the men's singles quarter-final day and the next day the women's semi-finals are played.
Steve Griffiths, LU's chief operating officer, said: "There is simply no reason to threaten Londoners with strike action. We have been in discussions with the unions since February, and are still in the midst of negotiations.
"We recognise the hard and valuable work of our staff and want to give them a pay rise this year and next.
"We also want to minimise the impact of the night Tube on our people, and compensate those it will affect most. But pay levels for our staff are already fair, and any increase must be sustainable.
"Londoners and businesses overwhelmingly back the night Tube, and trying to block something that will transform our city, and create more jobs, is short sighted.
"Strike action will only serve to lose Aslef's members pay and unfairly disrupt Londoners. We encourage Aslef to make themselves available to continue our talks at Acas."