The current model standing orders differentiates between statutory requirements and rules over which a council may exercise discretion by the use of bold text for the statutory requirements. The right to record is shown in bold, as it is a statutory requirement in England (but not in Wales). The legislative reference is The Openness of Local Government Bodies Regulations 2014.
If your parish council insists upon knowing whether or not somebody is recording, I would be inclined not to record that part of the meeting, which I presume takes place before the meeting starts, then change my mind a few minutes later. Standing orders would prevent me from interrupting the meeting to announce my intention to record, so I'd have to stay silent.
The alternative is for each member of the public to say "I may, or may not!"