Enfield No4 in .410 - any details??

[Alan de Enfield]

Just as an 'add-on' my local gunshop ( a few weeks ago) had a No4: 410 calbre for sale but didnt notice any particular markings.
It did NOT have the magazine well welded up, so as far as the Police are concerned it should be a Firearm (FAC needed) but it was being sold as a shotgun (SGC needed)

This thread inspired me to go-get-it (particularly as John Sukey would rip his back pocket off getting to his cheque book, and for someone of Scottish ancestory thats unlikely I know)
So for £150 ($210 US) I bought it home.

Lateish Savage 93C14xx

No markings to say 410 except UK proof on the Knox

Information

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[303 Collector]

About 2 years ago a load of BSA commercial SMLE's came onto the market. In the same shipment were several BSA factory converted .410 Lee Metfords which I acquired. All have full length woodwork and their original 303 magazines. The barrels have been replaced with a proper .410 barrel the same length as the original and are not the military barrel bored out.
I believe these shotguns and rifles were part of a consignment sent to Bahrain in the 1930's. I have often seen No4's and SMLE's in .410 but never Enfield and Metford long rifles converted in this way.
Has anyone seen anything similar or was this a conversion just for this contract?