No4 Mk1 Serial number question.

[Buccaneer]

I have recently acquired a No4 Mk1 ROF (F) date 11/43 rifle, it also has a No4 Mk1 F (FTR) 48 date on it. The serial number is JB20206A and it is the "A" suffix that I can find no explanation for on a No4 Mk1 rifle.
The engraving is not well done and can only been seen once highlighted and in good light but the "B" at the beginning of the serial number is definitely correct and not an "8".

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