I am currently concerned that areas like here, which have been low to very low, will fairly suddenly jump in cases if/when lockdown is eased. Given the low level of health facilities, it is all too likely to locally overwhelm services.I think Herd Immunity is an interesting strategy which of course would not work as it requires at least 70% of the population to catch covid then become immune. You then have to assume 70% actually want to catch it and if like me they don't then it would take a very long time to achieve, apparently it takes 1-2 years to achieve herd immunity anyway. People are coming out of their shells now lockdown is partially lifted but they would soon scurry back in again if the death rate shot up unexpectedly God forbid, so what price herd immunity then.
Just read flecc's post above and I would concede for London it probably is the best outcome, but of course London is but one city. How about Manchester, Birmingham and other large cities what would be best for them ? ok if you don't live there it doesn't matter directly to you but it would if people travelled from those places to your town/city bringing it with them. Some towns had signs lit up on major roads saying to would be visitors and holiday makers "Don't Come Here" to stop covid spreading, almost unbelievable really.
Someone I communicate with daily lives in a small but popular seaside town up the coast. The police have been rounding up and fining people daily - many from the West Midlands area but not exclusively. A day or two ago, one was identified and fined after he went up to a policeman to ask directions to the public toilets. (Not suprisingly, they are currently shutdown.)