And it is worth remembering that the CAA have prosecuted an instructor for breaching the 500ft rule during PFLs......................
Select a better area to do it then, without the persons, vehicles, vessels and structures present..... Even though we are a fairly 'congested' island, PFLs can be done to ground level in most counties of the UK. If you hang around and do several to the same piece of land, you'll get complaints..
ISTR when the CAA amended Rule 5 back in 2004/5ish, the UK continued to file a difference to ICAO to allow flight below a minimum height of 500ft agl. The UK is still one of the few countries that doesn't have a minimum height rule..