I was playing a game the other night ( joint Operations) and i saw this what is it?.
A mongrel. 
Scammel cab. Volvo chassis. RR engine.
its a ONVAVNO
scammel crusader as used by the forces AND TRANSPORT COMPANYS
Crusader. I drove one off and on in the 90’s. And it had a ROLLS ROYCE EAGLE in it. Bloody thing would do 80 but you couldn’t see straight and it took you hours to stop shaking. The radiator was hinged to swing out and it had a removable engine cover to make up for the non tilt cab.