can anyone ID this piece of Engineer kit?

[Les Freathy]

AH the world of plant, after nearly 40 years in the trade i thought i had kicked it in the arse. On a serious note i did in my time make efforts to beg steal and borrow all i could on old plant equipment in military and civilian use so i hope the following will answer a few questions
Dereks offer of the old Dinky Muir hill is based on the following illustration, it is the model 14B first built in the very early 1950s, when i was at the tender age of 16 i had a job working for a beach quarry on the Romney Marsh, if i say it was a karnos army out fit i would near the truth and was given the job of driving one of these to start with the revolving seat mechanism had to be welded as it was almost none exsistant and once loaded it had no brakes and i was informed whilst in motion to use a sand pile to stop. Great days eh!