Yes, unless the Parish Council's standing orders or the Village Hall's governing document impose any restrictions. Depending on the legal relationship between the two bodies, it might be more transparent not to have the same individual holding both positions, but there is no overriding legal impediment, as far as I am aware. In my experience, it is not unusual for people to hold multiple roles, particularly in a small community, but it is vital that they remember which hat they are wearing at any given time. As a trustee of the Village Hall, they must, under charity law, act in the best interests of the charity at all times, even if this is not in the best interests of the Parish Council. If the individual is appointed to the Village Hall governing body as an official representative of the Parish Council (in accordance with a procedure set out in the Village Hall's governing document), they are placed in an unenviable position!