We will one day get to 40c. That's not really anything to be excited about as such. It just goes to show each yesr the UK is getting hotter and in 20 years i dread to think what the "norm" is.
There is no "downgrade" as such, 30c is still hot and sunny and bearable for most people.
In 40c people would die, people with conditions would suffer, children, animals etc and our houses aren't made for that weather. Dont forget we dont have AC or shutters on windows like alot of europe.
I say enjoy the weather and look forward to a breakdown of storms whenever it will come. Its nice to have sustained warmth and sun.
I will admit though that fields are yellow. Everything is soooo dry