For those unfamiliar with such things – and I include myself – this is a Scammell Scarab.

Had a letter last week from Chris Randall who is busy restoring “one of two which were specially built for the opening of the Dartford Tunnel”.

He writes: “I would be grateful to know if any of your readers have any information regarding these vehicles, especially the design and build, or any stories.”

I’m sure there’s at least one person out there reading this who knows a great deal about the vehicle. Please get in contact and I’ll pass your details on.