Finally, finally, FINALLY, I have some 'Utility' answers. Thanks to a very helpful sponsor who wishes to remain anonymous we are near to starting the process of digitisiing all the AOMC engine number information held on 16mm microfilm.
I won't bore you with all the nonsense of seeking out a 16mm reader, blah,blah,blah, but I now have a sample demo file of what can be done with digitising and it includes the 'Utility' information. I will only say this about the original microfilm process. Never, never, never, leave it in the hands of an unsupervised office junior. It's obvious from the result how the organisation viewed the task of microfilming old records and how it got pushed downwards to the low man on the totem pole.. What a bloody mess. Anyhow, after much faffing about I've now got an overview of the Utility story. Getting it all correct and shipshape is going to take rather longer.
There are some 115 Utility recorded on the system. The great preponderance, some two thirds or so, are Villiers powered with either the early Mk VIIIC 148cc engine or its successor the Mk 12C, 147cc engine with some powered by the 123cc unit construction 8D/9D engine. One of these has the lowest engine number I've ever seen for this engine, AA686, so is from the first year of production, 1936.
Theoretically the Mk VIIIC ceased being used in motorcycles in 1931 with its role being taken over its successor the Mk12C but there are quite a lot of the earlier type. Did Villiers give Utility a good deal to use up these out of date engines? We'll never know will we.
From 1935 on there is a scattering of J.A.P. powered bikes, all ohv, and mainly 250 or 500's with very few 350 ohv. Mostly all dry sump versions but some not. It looks like 'Utility' did try to provide a bike with up to date technology.
I still have to plough through the handwritten initial registration dates which are an unholy mess so can't yet say when the first Utility was sold but we do know that this was yet another business that didn't survive WWII, so no post war Utility.
We are getting there, painfully slowly, but we are moving forward.
Cheers,