I seem to remember that the L34 EMER was classed above RESTRICTED and CONFIDENTIAL and therefore numbered to an individual. so they weren't common
The strangest thing that I was ever asked to do was........ and you ain't going to believe this......... was paint a bloody dolls house for one of the EME's kids. He was actually a nice bloke and did a lot of the in depth paperwork that allowed the REME to sponsor me at Uni. We also put a load of his sons well worn, battered and bruised Dinky Toys over to the paint shop and sprayed them khaki. The Sgt running the A&G section saw that they were all Bedford QL's and RL's, Champs and 1 tonners and said that he was going to put them all on official paperwork so that the FORWARD counters (an almost medieval method of time and lack-of-motion study) back at Stats Group (the statistics brain deads) would think that our output was increasing beyond recognition.
This 'FORWARD' method of time accounting and study taught me early on that you should NEVER confuse motion with action. FORWARD stood for something but like most blokes on the front line, someone invented another set of words that could be used. I only remember that the F and the O stood for Fxxxxxx Obstructive......... Anyway...., I digress