I've often wondered what would happen if you took some near IR, eye safe, ultra bright LEDs and strobed them at 60 Hz from your headgear in an omnidirectional fashion, pointing away from your body and avoiding nearby floor reflections. You'd stick out like a sore thumb (which I wouldn't mind, as I'm not a criminal nor doing anything wrong!) but it would be enough to likely "opt out" of facial recognition via dint of blinding the camera in the vicinity of your face.

Britain has all sorts of laws like "attempting to pervert the course of justice", so you'd have to be very careful to not accidentally cover for a "real criminal", but just to preserve privacy it might work (especially if more than one person did so).

I've never had the guts to do it, but I do really hate facial recognition and all of this surveillance capitalism.

You'd be charged under the Computer Misuse act. /i