The condition for starting discussions on a four-day workweek included agreeing to a 3.8 percent pay increase and canceling "all pending industrial action."

Tube drivers have been offered a four-day week by Sadiq Khan’s Transport for London in return for calling off strikes. A letter from Nick Dent, the TfL director, to the Aslef trade union on Tuesday pledged to “set out a proposal for delivering an average four-day working week”.

Revealed: Tube drivers offered four-day week, pay rise and fewer hours a week in return for calling off strike - Aslef hails ‘groundbreaking deal’ but critics describe it as a ‘sell-out’ by Sadiq Khan