A 24-hour strike by London Underground workers is to go ahead from Wednesday evening in a bitter row over plans for all-night Tubes.

Thousands of workers from four unions are due to walk out, shutting down the service - on which 4million journeys are made every day - for the second time in a month.

The drivers' union Aslef accused LU of being "completely inflexible" over terms and conditions for the service, leaving it with "no other choice" than to press ahead with the walkout.

The union said the company should postpone the planned launch of the service on September 12 so that further negotiations could be held.

Despite last-ditch attempts to avert the strike, members from RMT, TSSA and Unite will also take part in the industrial action from 6.30pm.

There will be no Tube services all day on Thursday.

Extra bus and river services will run, and all other public transport services and roads will be much busier than usual.