I've never heard of a heat dome in London... but accept I may be wrong.
There wasn't in mainland Europe until there was. There wasn't in Canada until there was. It's future planning for emergencies.
My point is when there is very hot weather, the most vulnerable are often not out in it
Being out in it isn't the issue. People die in their homes in heat events. This map is supposed to show them where they can go OUT to to get cool.
and in the case of the very elderly, are often not online either.
True. But people that work with them will be.
I'd add the percentage of very old, vulnerable people residing in central London where this map covers is very low too and due to built up nature of the city will usually have someone looking out for them.
It goes down to Croydon, where I can assure you a lot of older, poorer, vulnerable people live.
I have nothing against safeguarding all human life from extreme weather, where and when it is necessary and appropriate to do so. I just think the NHS stand a far better chance of saving lives in extreme weather than an online map of cool places.
During heat events the NHS will not cope at all. And if someone is already ill, they may well die. Making sure they don't get sick in the first place, by cooling, is the goal.
And, as a comms person myself it strikes me that a wet weekend in June is a bizarre time to alert us all to what is essentially a map of common sense.
As I said before, the most dangerous time for heat events (and the most fatal) is early in the summer when people aren't expecting it and aren't acclimatised. And it's not common sense because you keep repeating things which are 'common sense' but untrue.