Here is some more evidence to support the theory that the truck is a Mk4. according to memory the headder type exhaust system didn't appear as replacements on Mk3s until the mid 70s and the cab and cab front ends until 1970. This is supported by EMEIs. EMEI G557-42 details the replacement of "single piece exhaust systems with two piece systems ".The EMEI is dated July 1974, and initially the replacement was to be done when the exhaust manifold was cracked but was later changed to when any component of a single exhaust system needed replacement". The policy appears to be part of the standardization of the fleet. A similar situation applies to the replacement of cabs, with the EMEI dated 1970 detailing the procedure for replacement of cabs and the part numbers and DSNs of parts to be ordered being Mk3 not Mk4. It is important to note that replacement of cabs and cab parts was only done by BASE workshops. There were only Field workshops in SVN, so a cab would not be replaced in country. The truck pictured has the re-inforced (ribbed) hubs, later tool bin and full roof guttering as mentioned. We must remember that the photo was taken in 1971, so the chances of it being a rebuild rather than a Mk4 are fairly low to say the least. I have to admit that I have more than a passing interest in this truck because if it is a MK4 it may be one I have. The horn is placed on the bumper on the drivers side of the brush guard, which is not a standard position. The Mk 4 I have has two 1/4"holes drilled and tapped there and it is by chassis number the first Mk4 cargo truck built, in 1968. Hopefully all will be revealed in time