I think that N247 and N248 were the S6A's and S1595 and S1596 were the S6B's.
That is correct
Until the 1960s, S.6A N248 (currently at Solent Sky, below) was displayed incorrectly as S.6B S1596. It has certainly been displayed correctly as N248 since 1983 when the museum opened.
The correct serial of this aircraft was re-applied in
1976 soon after it was delivered to the Museum's previous building. It had been marked as S1596 (the second S.6b) for many years but the float length (22 ft rather than the 24 ft of the S.6b) , layout of the float radiators and the additional wing-tip cooling scoops (blanked-off on the S.6b) together with 1929 data plates, showed that this identity was incorrect.
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Philip Morten