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