What make of truck is that ?

I assume you are referring to the truck that crawled over the rugged terrain in the smuggling gambit.
As a funny coincidence, the film ran on the television yesterday & I specifically looked twice for the truck make on the front near the grill but I could not discern the name.

I would say a 1950's Leyland Octopus.

http://encarsglobe.com/photo/im/leyland-octopus/01/

It says Leyland Diesel on the side (visible when they are removing the tire -- sorry tyre : in the river). It also says Leyland over the grill.

I was much more fascinated with Diana Dors than the truck er ah lorry.