Ta for that. Didn't realise the service life was that long.
Off topic - sort of - I'm sure as a youngster in the late '60's/early '70's I saw Lee Enfields converted to shotguns advertised in the Exchange & Mart.[/QUOTE]
They were, either smoothbored .303” or bored further out to .410”.
Removed from S2 to S1 in the post-Hungerford law changes in 1988 or so, because of mag size. I think most were then deactivated, but a few survive either at S1 unchanged or with blocked/welded mags at S2.