London Underground workers are to ban overtime in a dispute over jobs and ticket office closures even though an action plan has been announced to tackle staffing concerns.

Members of the Transport Salaried Staffs Association (TSSA) will launch the action on December 8 after voting in favour of strikes and other forms of industrial action.

The union is warning staff safety is being affected because of an increase in verbal and physical abuse from passengers since a programme of ticket office closures started.

London's Mayor Sadiq Khan said he will act on a review of ticket office closures by Travel Watch.

The review was commissioned by Mr Khan to examine the impact of ticket office closures under previous mayor Boris Johnson.

It identified a number of issues, including measures to make staff more accessible to passengers, to provide better visibility of staff and to update ticket machines.

The report concluded ticket offices were closed before steps had been taken to provide decent alternative provision and to ensure all passengers continued to get the proper service they need, but does not call for them to be reopened.

The Mayor said: “Today’s report makes it clear more has to be done to ensure passengers can get the right information and support when they need it.

“I have now asked TfL urgently to present a full action plan responding to all the concerns outlined in the Travel Watch report.

“Where the necessary alternative provision was not provided after ticket offices were closed, we now need action straight away.

“Millions of commuters use our stations every day, and we must do everything we can to ensure every passenger feels safe and can access the assistance they need.”

TSSA general secretary Manuel Cortes said: “We welcome the urgency Sadiq Khan wants to tackle the serious shortcomings identified in Travel Watch's report.

“The truth is Boris Johnson’s ill-conceived and badly executed ticket office closure programme has created many problems for passengers and for our members.

“Put simply, there is not enough staff on our Tube – we hope TfL now address this without further delay.”

Talks to resolve the industrial dispute will resume at the conciliation service Acas next week.

Rail Maritime and Transport union general secretary Mick Cash said: “While RMT welcomes the principal of having a report into the closure of Underground ticket offices, the TravelWatch document has been a big disappointment, and an opportunity missed, as it fails to tackle the crisis of understaffing on the Tube.

“That is why we have industrial action ongoing as we speak in the form of an overtime ban.

“The pressure from our members on the Underground to resolve the problem of lack of staffing is immense.

“The staff removed under the Fit for the Future programme must be replaced – RMT is fighting for this to happen at the earliest opportunity.”