I am not in the South-East, I live in an old house with thick walls covered in vines, wisteria and roses, in a shady garden.
I have lost 35kg so I do not feel the heat like I used to.
It got to gradually, so I have got used to it.
I have had the attic hatch open for months to let the hot air out of the house.
Fortunately, it will be cooler by the end of the week.