red964,
Fair enough, it is the bit about it being at a “jaunty angle” and it “towering above the road” that is confusing me as I do not believe that PM651 has ever been displayed like this.
Really stumped
Found it!!!!
This is what is now on the gate at RAF Benson.
MyAviation.net:

Photographer © Darren Smith
It is a PR Mk.XI Replica “EN343”