LONDON Underground will grind to a halt tonight as almost 20,000 Tube workers walk out on strike.

The Tube’s four unions, blue-collar RMT, white-collar TSSA, drivers’ union Aslef and general union Unite, will lead 24-hour strike action from 9.30pm in opposition to Transport for London (TfL) plans to impose all-night work.

Last-ditch talks were convened with conciliation service Acas at 1pm yesterday, but a few hours later Aslef lead negotiator Finn Brennan confirmed that the strike was on.