It might not be. I see this council in Kent went ahead as threatened and introduced a PSPO against drones last April: https://www.tmbc.gov.uk/__data/assets/pdf_file/0004/969601/Public-Space-Protection-Order-2020.pdf
PSPOs (which I’d never heard of until today) can be used to criminalise a wide range of lawful activities, on the whim of a council. Many find this disturbing. https://www.local.gov.uk/sites/default/files/documents/10.21%20PSPO%20guidance_06_1.pdf
EDIT: I see there’s a separate thread on this: Anti Drone Public Spaces Protection Orders