A second postal strike at Stanmore’s Royal Mail sorting office has been announced for next week.

Angry staff will stage another walkout on Monday, September 30 at the Parr Road depot, Honeypot Lane.

Yesterday, up to 50 members of the Communication Workers’ Union went on strike in a row over working conditions.

The sorting office stayed open but Royal Mail was forced to bring in volunteers and managers from as far away as Bedfordshire.

The postal firm is urging customers it will do its best to minimise disruption, but posters will be displayed at the branch to advise people about services.

Post Office network and sales director Kevin Gilliland said: “The CWU are calling for an above inflation pay agreement when last year our overall performance was a loss of £116m. We must reverse this loss of public money.

"Strike action can only cost our people money, cause disruption to customers and threaten our plans to turn the business around and keep our branches on high streets and in city centres across the UK.

“The CWU have refused their members a fair and affordable pay offer of cash payments totalling up to £3,400 by April 2015, and are failing to recognise the financial realities faced by the Crown network.

“Any action will not affect over 97 per cent of the Post Office network and the majority of Crown branches have remained open during previous strike action.”