Sir – Last week, in the rain, I was trying to use the crossing at the bottom of Woodstock Road when I was forcibly stopped halfway across by a Darth Vader-like motorcycle policeman.

He said I must wait until a VIP motorcade had passed. In the far distance could be seen flashing lights and sirens and shortly hoved into view the bomb-proof black Range Rover of the Prime Minister.

The car was travelling at about 60mph, despite it being a 20mph zone. I wondered why the PM was in such a hurry; then it came to me. He must be on his way to Osney to have a drink with Christopher Gray.

Paul Hornby, Oxford