London Underground drivers who are members of the Aslef union are set to go on strike in April and May.

The train drivers’ union said members would walk out for 24 hours on 8 April and 4 May after 98% of its drivers voted in favour of action. The union added there was a 70% ballot turnout.

Finn Brennan, of Aslef, said the action was part of a “long-running dispute”.

Transport for London (TfL) said it had been in “long-term discussions” with union staff.

Aslef’s Mr Brennan said: “Despite a previous commitment to withdraw plans for massive changes to drivers’ working conditions, London Underground management has established a full-time team of managers preparing to impose their plans.