Firefighters in the FBU union in Humberside and South Yorkshire are holding ballots for industrial action short of a strike in two separate disputes over imposed changes to work patterns.
Around 100 train conductors in the RMT union working at London Midland depots at Bletchley, Northampton and Watford are set to strike for two days from Sunday.
Workers on London Underground are pushing hard to win a strike ballot taking place among 10,000 RMT union members over pay and job cuts. They know the stakes are high.
The possibility of a London-wide strike at Royal Mail grew this week after bosses refused to back down from plans to slash jobs at offices around the capital.
Drivers in the Unite union working for First Bus in Sheffield, Rotherham and Doncaster in South Yorkshire have voted by 403 to 42 in favour of strike action in a consultative ballot.