Postal workers are continuing a second day of industrial action with strikes set to spread into next week, in a bitter row over pay, jobs and services.
The Communication Workers Union said its members in areas including London, Northampton, Peterborough, Birmingham and Coventry walked out for 24 hours and are being followed by employees in Bristol, Edinburgh and Peterborough.
Strikes will spread to East Anglia on Monday and Stoke-on-Trent on Tuesday.