Hi Mark
Glad you were patient, and now I hope you will find MLU and its participants well worth the wait . Now to your question were CMP LAAT 60s used by the British Army, I suspect that the answer will be yes. Now to the question of how to prove it, photographic proof will probably be most interesting. A quick look through histories of British Units such as the Desert Rats show that they used a lot of CMPs all the way from North Africa, Italy into Germany.
Looking forward to seeing more photos of your equipment.
Though not of LAATs in British Army, you might find some of these photos of interest LAATs in British Columbia
http://canadianmilitarypattern.com/C...20Columbia.htm
http://canadianmilitarypattern.com/R...20-06%2014.jpg
Cheers Phil
PS- Yes, I really need to move copies of these photos inside MLU archive instead of showing them as a link