Earlier quoted context omitted.
I lived in London for some years and wouldn’t choose to go to the UK as a tourist in the summer. There is a reason everyone in the UK goes to Europe in summer - it is much nicer.
I live in London and would choose to go to the UK as a tourist at pretty much any time of the year. Plenty to see and do. London weather gets bad rep but I find it pretty good. Rarely goes below zero degrees Celsius and is rarely so hot that you struggle. I actually prefer London weather to central/south European one for example. More consistent, pleasant all year round. This is all personal though...
When I was in Paris a local informed me that Paris gets more rain than London. I suspect though London rain is more spread out throughout the year.