Post workers have gone on strike in a wage dispute.
Members of the Communications Workers Union (CWU) left on Saturday. The strike will affect Crown post offices: larger branches are often located on main streets.
It is the second union action since the conflict broke out and the union does not rule out new strikes.
The CWU said the 114 Crown post offices would close on Saturday, and warned that the supply chain strike means there will be no cash collections or deliveries to post offices on Monday.
The union said the post office had insisted on a pay freeze for 2021-22 and a “more marginally” wage offer for 2022.
CWU Deputy Secretary Andy Furey said: “Our members have worked hard to make a great annual profit for the company; affordability is not a management issue here. Frankly, their excuse. degrading for an offer has only hardened members, who will not tolerate a collapse in their standard of living.
“We thank the public for their understanding and support, and urge the Post Office to turn the table around and approve a real deal that treats the heroes of key workers with the respect they deserve.”
Some 3,500 trade unionists are involved in the dispute.
A spokesman for the Post Office said: “We want to assure our customers that the vast majority of our offices are not affected by the CWU strike on Saturday. There are 114 offices, usually in the city center, which are managed directly by the Post Office. .
“More than two-thirds would normally only be open between 9 a.m. and 12:30 p.m. on Saturdays. We apologize to customers who have been bothered by a closure.”
The union said the wage offer was a wage freeze from April 2021 and a 2.5% increase and a lump sum of £ 500 from April this year.
Members of administration unions and supply chain networks will go on strike on Monday.