Hello again Tom. I'm as certain as it's possible to be that the "Exclusive" was available in the shorter length and that ours is an example. The giveaway is the window shape I believe (from the outside at any rate). Yours and ours have an odd shaped window behind the cab; the "Classic" (or just "Van") has a regular rectangular window here.
It's also described as "Hobby Van Exclusive" on the registration document. Good enough for me I reckon. Intriguing discussion though.
Now quite keen to sell it soon, I must get around to advertising it more widely.
All the best
MartinB