I have an ordinary doorbell and a camera to view my drive etc. linked to our mobile phones. We can speak to whoever calls etc but as stated previously they can be a bit slow to access but as we frequently get deliveries left on the doorstep since the start of covid without the doorbell being rung I find it invaluable. It has also been triggered by a cat, a fox and a rat ugh! and once even a balloon which very spookily drifted up the drive and made me jump out of my skin when it burst on catching on the cars number plate, that made me laugh though.
To think that London, or anywhere else for that matter, does not belong to any one demographic
Lack of public toilets in towns.