Bringing the story up to date, here Peter was photographed by his son at the Blackgate Road terminus of the 1 with Olympian 5882, E228CFC, an Alexander bodied example new to City of Oxford MS.
It provides a nice contrast with the first ever photo taken of Peter at work.

Photo from the Peter Cackett collection, photographer Peter Cackett Junior, taken Shoeburyness, Blackgate Road