RAF Squadron Leader's Pennant

Accompanied by a sailing pennant marked RCYC Team RAF NSC Race 1949. We do not have any direct provenance with these items but have speculated the squadron leader was also a sailor and a member of the Royal Corinthian Yacht Club. We have yet to positively ID NSC, although could possibly be Northampton Sailing Club. The squadron leader pennant measures 31" x 22" (79 cm x 56 cm) and is in good flown condition. The sailing pennant has a couple of moth nips while the hand embroidery is very crisp. Seeing both came in from the same source, we assume they date from the 1940's.