Yes, truly incredible temperatures! I can't even imagine what 46°C+ must feel like!
What's even more incredible is much of the Pacific Northwest of the US and southern British Columbia have very similar climates to much of the UK. It is only a matter a time before we see a 40°C heat wave here.
Not sure its a matter of time here. We are a tiny island surrounded on all sides by water.
If the wind is in the right direction in North America, it is directly continental with no temperance from any body of water.
I know they have the Pacific to the west, but north, east and south is land, and lends itself to much easier passage to extreme heat.
I do think 40c is a remote possibility in the UK, but certainly wouldn't say it's just a matter of time.
I think it would need several days or even weeks of direct southerlies to get us to that threshold. Even a short track across a relatively cool English Channel would temper things slightly.
That said, we have got close in recent years, within a degree and a bit, but its very unlikely in my view, although certainly not impossible.