Hi Richard:
Being new to the FV432 operators club (we have two) I started looking closely after I stopped laughing:
This strange beastie has a huge hatch on the side, much bigger than the normal oval;
The headlamps appear to have been repositioned Abbot style;
I can't see an exhaust system on top (as per the B81 version); and
The back end appears to slope inwards.
The missile on top is rather interesting  
 
 
Any ideas?  Used in some childrens' action movie?  I can't get onto Ebay... how much were they asking (pure curiosity).
By the way are there any good sites for FV432 advice as we need a lot!  
 
 
Cheers, Mike