Hello Keith,
I was there about 20 years ago, we were able to salvage some parts from a Humber Heavy Utility and some parts for an Austin, there were also some dodge 1/2 ton Carryall's and Ambulances I believe. The most special vehicle we found was a GMC ACKWX-353 should be an ex pre war French contract diverted to the UK. I wonder how much is left of the vehicles, as they were almost in the same shape as you found them.
Green greetings
Hendrik van Oorspronk
PS.Niel the steeringbox from your C15TA came from this place, from a cab 11 or 12