Re: Face masks
The trouble is, they will probably be regarded as attempting to avoid facial recognition, and up with an arrest - like the bloke down south who was lifted for trying to hide his face (okay, technically they got him for swearing, but the precipitate was him hiding his face).
If crime was very prevalent in British society, I might have a slightly different perspective on widely deployed facial recognition (though not likely very different - it is just plain wrong), but it isn't, and so I don't. The balance of rights v responsibilities doesn't favour applying hugely privacy-infringing technology for the small benefit it would give.