London tube users warned to plan for disruption as strike action escalates

Action will bring services to early finish on Sunday and close underground entirely for four days from Monday

Tube users have been urged to check before travelling this week as strikes by staff escalate, bringing services to an early finish on Sunday evening and closing the London Underground entirely for four days from Monday.

The RMT union has batted back pleas to call off the industrial action, involving about 10,000 workers, as it attempts to secure a shorter working week as part of pay negotiations.