When a council resolves to go into closed session pursuant to Section 1(2) of the Public Bodies (Admissions to Meetings) Act 1960, the press and public are excluded from the meeting. Usually this happens when the council discusses a sensitive issue such as considering tenders or perhaps the health of a councillor. Therefore minutes of the meeting held "in Camera" or closed session are not public documents, even if a FOI request has been made, there is no automatic right for a member of the public to see them.
Sometimes a council may decide it is right to release the minutes but this can only be done by resolution of the whole council.