I agree with you, Geezer, although I personally prefer the elegance of the Mk3, as did a friend of mine who bought one after he saw my own.
I produced for the site, a few days ago, a comparison between a 1922 BSA v three Mk3s, which you might find of interest.
Generally, the trigger is stiff for the Mk3 but if it is loosened too much, I discovered it might discharge accidentally. A stiff trigger affects accuracy unless and until the owner properly becomes acquainted with his rifle. Furthermore, on the foresight, the blade is not as good as the bead on the Standard - in my opinion. I found that a bead provides a sharper image - just a personal preference.
Out of the three Mk3s - one belonging to a friend - we have discovered that BSA Elites do best and, remarkably, I achieved some 11.8ft/lbs on my 1968 Mk3 - which is exceptional. Superdomes are not too bad and Defiant Vintage (if you can find them), are pretty good but I noticed there was a difference with the later Mk3, which was produced in Nov 73. At some point - not sure when but perhaps around '69-71 - the Mk3 embraced button rifling and this presumably upset the pellet preference above. Not sure when your Series 3 were manufactured.
The accuracy leaves a little to be desired on a Mk3 - 3/4in from 12 yards - but the trigger and blade played a part in this, I suggest. These can be mastered as one gets to know the rifle better - an essential requirement.
In my view, they were designed to be shot with open sights and I doubt I shall fix scopes to mine. I shall sight them in for 25-30 yards and then study the holdover and holdunder for different ranges. Certainly, they produce a better challenge and better sport than pre-charge rifles, which are characterless and make everything far too easy.
Let us know how they shoot. It would also be worth testing various pellets through a chronograph to see what readings you get.
Like Aubrey, I had one of these when I was 12/13 and hit plenty of pests with it but then traded it in for an HW35 which had a useless spring in those days, which lost power after some two tins of pellets. The Airsporter which followed was hopeless and undermined my faith in BSAs. Over 40 years later, I have just bought two Mk3s.
Rgds
Andrew.