Sir – Thank heaven for the police officers of the Thames Valley force.

When they could have been covering themselves in glory apprehending burglars, muggers, rapists and other assorted criminals, they selflessly devoted their time to trapping motorists travelling north at 24mph in St Giles.

Definitely north, because you would be lucky to exceed 10mph travelling south in St Giles.

Perhaps the council are running short of money again.

Tom Williams, Oxford