Staff at Barkingside and South Woodford post offices could walk out on strike for the second time in just three weeks on Friday.

The Communication Workers Union (CWU) called for another spate of industrial action last week because Post Office bosses had “refused to alter their position” in a meeting following the Easter Saturday strike.

It is campaigning for changes to a pay offer for staff and wants the company to scrap plans to franchise 70 crown branches, including Barkingside.

The office, in High Street, will be closed and moved into a shop if a “suitable retail partner” can be found.

It is one of 70 crown branches, which are run directly by the Post Office, under threat as part of cost-cutting measures to stem losses totalling £40million a year.

CWU official Andy Furey said there was “no option” but strike action.

He added: “We will not lie down over these issues, we will not be going away.

“This is far too important to the livelihoods of our members and to the communities facing the loss of their crown post office.”

Redbridge’s other remaining crown branch, South Woodford, in George Lane, is also expected to join the strike.

Post Office network and sales director Kevin Gilliland said franchised branches will offer “the same range” of products and services.

He added: “There is no room for manoeuvre and further strike action will only cause needless disruption to customers.”

The strike will start at 2.30pm. No other Redbridge post offices will be affected.