Tony,

I see this got a mention in the Bromley Times this week.

Perhaps one of their readers can positively id the vehicle.
On that note, have you tried researching the Kentish Times archives? I am sure there have been similar pictures in there before over the years.

On the other hand. Perhaps the current owner of the number will eventually
hear of it and will be able to confirm if it is attached to the same basic machine, or not, as the case may be.

Rod