Communication Workers Union spokesperson Andy Furey said Post Office workers did not want to strike, but were determined to "secure a fair settlement." He said he was optimistic about agreement being reached.
Roger Gale from the Post Office said the Communication Workers Union were making "unrealistic" pay demands considering the fact that the company is losing £37 million a year.
The union was asking for a pay increase of three and a half percent last year, and three and a quarter percent this year, which Mr Gale said was "unaffordable."
The network and sales director at the Post Office has said he is "disappointed" after the Communication Workers Union said its members will launch a fresh wave of strikes from today. Kevin Gilliland added:
This action can only cause disruption to customers, cost our people money and place further pressure on the Crown network which is currently losing £37 million a year.
We must continue with our plans to turn around the Crown network to ensure we keep these branches on high streets and in city centres across the UK.
Crown post office workers are prepared to take prolonged industrial action to defend jobs and win a fair pay rise, the deputy general secretary of the Communications Workers Union said today.
Dave Ward added:
This is the first time we have announced two days of strikes at the same time and the first time we have announced back-to-back days of strike action.
This is a company which made £94 million profit last year and paid out £15.4 million in bonuses to senior managers.
It's a clear case of double standards and trampling those at the bottom for the benefit of those at the top.
Workers at Crown post offices will today launch a fresh wave of strikes in an escalating row over jobs, pay and closures.
The Communication Workers Union said its members will walk out in the latest industrial action linked to plans to franchise or close more than 70 Crown sites - the larger branches usually found on high streets.
A UK-wide stoppage will be held today, staff in Scotland will strike on Monday, and union members in England, Wales and Northern Ireland will stop work on Tuesday.