The Mayor of London has been lambasted for his pre-election pledge of “zero strikes” as commuters face more delays this morning due to another Tube strike.

The latest walkout by RMT and ASLEF drivers, will be the fourth overseen by Sadiq Khan in his first 10 months.

It means there is no service on the Waterloo & City line and limited Central line services until 9pm tonight.

As a result, commuters in Romford are set to bear the brunt of delays today as a major congestion pinch-point is predicted to on TfL rail services between Romford and Stratford.

Havering’s London Assembly Keith Prince claims it means Mr Khan has the worst strikes record of any London Mayor with a projected yearly average of 5.05 strikes.

Mr Prince said: “The Mayor has previously been keen to point to his strikes record as a measure of success against his predecessor.

“The cold hard facts now are that he is on track to have the worst strikes record of any London Mayor – and one that looks set to get worse.

“Having already broken his zero strikes pledge last summer, the Mayor has more recently caved to union demands in a desperate bid to avoid further damaging industrial action.

Previous mayors Ken Livingstone and Boris Johnson are said to have averaged two per year and four per year respectively.

The threat of further industrial action on the Night Tube is thought to mean the mayor’s record on strikes could get even worse before the end of his first year.

Mr Prince has called to on Mr Khan to get “London moving again”.

“The unions sense a weak Mayor who will do anything to avoid further walkouts and can be bullied into a deal,” he said.

“We now have a hugely disruptive strike because eight drivers don’t want to move locations from east to central London – a common daily commute for thousands of ordinary Londoners.

“It is time he admitted his failures, stopped blaming his predecessor and came up with a plan to get London moving again.”

A Mayoral spokeswoman said: “This is more desperate nonsense from the Tories.

“The number of working days lost to strike action under Sadiq has in fact reduced by 40 per cent, substantially reducing the disruption faced by Londoners.

“The Mayor is cleaning up the toxic legacy of Boris Johnson, whose last three years included record levels of industrial action.”