Thanks to all who replied, and Gary for offering up the correct front mount which appears to be a major piece I was unaware I needed !
I’ve done a bit of reading on the BA21 and it would appear mine is an early non recessed variant, but appears to have been hand fitted quite tight to the action, so against all advice in the name of originality to the rifle I’m going to persist and set it up as it was originally sold with the correct rings on the BA21 and see how bad it is (or isn’t) in terms of zero, and will report back here with the results.
If it all goes to the dogs I will probably just revert to a standard No4 ladder sight.
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