Up to 1, 000 workers are involved in the action, and south Wales area manager Ninian Le Blanc said there was now only one sticking point over disciplinary procedures.

BBC: Appeal for end to post strike

"The cases of the individual employees concerned have been through the full procedure, and following appeal, a decision has been taken to terminate their contracts, " said Royal Mail Area Manager Ninian Le Blanc.

BBC: Post box

"There is literally one sentence which divides us and surely we can thrash that out while employees are back in work earning money and carrying out their duties as normal, " said Mr Le Blanc.

BBC: Appeal for end to post strike