A quick search in the National Archives catalogue for 543 in AIR 27 gave me this:
- AIR 27/2855 No 543 Squadron: Operations Record Book. With appendices 1958 June-1960 Dec
- AIR 27/2875 No 543 Squadron: Operations Record Book. With appendices 1955 Sept-1958 May
- AIR 27/3117/2 No 543 Squadron: Operations Record Book. Appendices only. 1960-1965
- AIR 27/3122 No 543 Squadron: Operations Record Book. With photographs 1961-1965
- AIR 27/3201 No 543 Squadron: Operations Record Book. opened in 1996 1963-1967
- AIR 27/3202 No 543 Squadron: Operations Record Book. With appendices opened in 1996 1966-1971
Looking at those records should give you an idea about what has been officially released.
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Philip