Just to wrap it up Robert, in 1/76 modellers are well served:
The Airfix Ambulance version (they do a soft top as well - and a 105mm Light Gun come to that):
And Oxford Diecast do a few variants and in different finishes too:
All filched off the www.
If I was a small-scale modeller I think I’d pack it in looking at the quality of the ready-made diecasts.