I attended a gun show in Whitehorse, Yukon Territory two years ago where I purchased a No32 MK1 scope that was sitting in a pair of rings. The scope had been used on a hunting rifle, I guess the fellow who owned it had problems with clearance when trying to mount the scope so he took it to a grinder instead of purchasing some taller rings. You can well imagine........!!!!!!!!!!!!!!!
After the purchase another fellow and I were inspecting the de-bauchery, he in conversation told me he had an original mount at home he would be willing to sell me for $100cdn, I told him to run home and get it I would have the cash waiting. When he returned, the mount he produced was not the normal 32 mount but the SAS/Roal Marine mount as you describe it..........complete with allen screws and scope pads!!!! It was void of any markings but I knew it was Enfield something and appeared to be a high quality unit so I paid the fellow and off I went. Well at least now I know a bit more about my purchase.
The question I would have if putting your mount on an existing rifle such as your L42A1 (with the plan to shoot it and excuse me if I don't have the correct lingo, not an expert in the field) how would you collminate the bore to the mount?? From what I understand, the mount was secured to the pads originally and then the ündersize bore of the rings were machined after to keep mount and bore on the same plane. I guess if one was to shoot the rifle only at one specific distance scope could be adjusted accordingly but what happens if you would want to increase elevation or decrease to shoot at a different distance there would be a accumulation of error on the horizontal plane.
Anyhow someday I may try to make up a usable sniper with the the mount and pads I purchased.
regards.

---------- Post added at 12:23 PM ---------- Previous post was at 12:15 PM ----------

Sorry forgot to ask. Just curious what the mount and pads I purchased complete with hardware might be worth on the open market? I assume i did all right!!!