The UKs climate is driven by wind pattern (jet stream) ocean temperatures and the sun.
It is well published that suns activity (and strength) varies through the solar cycle (which is about every 11 years when it’s magnetic poles reverse, so 22 years for complete cycle)
It is also known there are longer cycles (and elliptical orbit) also affects suns warming. It was warmer in Britain when Romans were here, cooler during dark ages, warmer again during 1400s and 1500s, then cooler during Maunder Minimum (little ice age). All evidenced from tree growth rings.
Appears sun spot activity has been very low and could actually be entering another of the Cooler periods like 1700s, so insulating house, getting solar panels and a big electric energy storage unit (think Tesla powerwall, other brands available) is way forward.
As for sea level rising, I thought it had fallen again over last 15 years or so, which is why you rarely hear about it now.
One of the oddities of British weather is the weaker suns activity seems to be causing less buckling of the jet stream, so getting periods of high pressure at times (think of the lovely weather at start of first lockdown), but side effect of this more static setup is it can have 2-3 weeks of hotter temperatures in summer and colder in winter as air gets trapped. Can also lead to wet periods being longer (higher risk of filling rivers and flood plains, which isn’t really a problem except where some idiot built on them).
The current situation in Canada seems to be one of these trapped air, as jet stream buckles are elsewhere (probably explains why some US National Parks are still too cold and snowy to open at normal time this year).
When we lived on SW London - Surrey border needed to use our portable air conditioner at times. But since moving to West Wiltshire it has stayed unused in garage, doesn’t get so hot here (although new house being B rated for energy means better able to cope). However the hills around here (near Bath) meant we changed to all season tyres on second car, and have a set of winter wheels and tyres on main car for November-April (much safer in wet below +10c, and stops you ending up in ditch when frosty, and can still drive up a hill when it snows with 2 wheel drive)
If you want to protect yourself, then get an allotment or garden big enough to grow some food for when inevitable shortages occur.
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