I have the dispensationAre they correct though, we have a dispensation from the Police for moving vehicles up to 4.3m.
If those inconsiderately parked vehicles are preventing you going about your lawful business, then they are causing an obstruction.
Park up and call local Bobby.
Most Parish councils are populated by people who have the time on their hands to do it, and who are full of their own gas. Common sense is not part of the job description.