The national rail strike has been called out, but the threat of a Tube strike is now looming.

London Underground drivers are to be balloted in a row over working new all-night services.

The Aslef union claims it has been told that unless drivers agree to rosters which include all-night services on Friday and Saturday nights when they are introduced in September, they will be imposed and no pay offer will be made this year.

Finn Brennan, Aslef's district organiser, said: "London Underground has closed down the negotiations and written to us to say that they intend to go ahead and implement new rosters, with unlimited weekend and night shifts, without agreement.

“The only discussion they have offered are 'workshops' on the fine details of their plan.

"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.

"Sadly, because the company refuses to negotiate seriously, we are left with no other choice than to ballot our members on industrial action."

Around 80 per cent of all London Underground drivers are members of Aslef.