[Derek]

Hmmm the Police, who cannot go on strike, don't get their pay award backdated.
Police support staff, who can go on strike, get their pay award backdated.

Coincidence or magic?

Originally Posted by BBC News

More than 70,000 police support staff in England and Wales, including 11,500 community support officers (PCSOs), have accepted a 2.5% pay deal.

The pay rise will be backdated to September, in contrast to that offered to regular police officers.