Can a co-opted member vote to accept Precept figure agreed at Finance Committee which he was not allowed to attend

Question

The Finance Committee will be passing the agreed figure onto the full Parish Council for approval. The full Parish Council is only six members - the five elected members sitting on the Finance Committee, plus the co-opted member.

Answer 1

Yes - once appointed, a co-opted member has exactly the same status as an elected member.

The composition of the finance committee is a matter decided by the whole council.  Presumably you are implying that the co-opted member was not appointed to the finance committee by the council.

The finance committee (just like a council meeting) must be open to the public, including council members who are not members of that committee.  Except in the case where a specific motion is passed, for good reason, to exclude the public.