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So, you have a AV3470 1944 and an AV3602 1943

Here is an AV3536 1943

That makes sense - I couldn't fathom out how they had got thru' the doubling-alphabet (AA-AZ, then BA-BZ, then CA-CZ etc etc) in such a short period of time.

I'm getting confused here - my BSA 4T is 1943 and the serial is AV35xx

Did they go from an AA 2-letter prefix (Did they go from AA to ZZ) and 4 digits to a single letter prefix and 5 digits...