I'm in Kent too, which part are you? The corner near London is indeed pretty hot in the summer, I had actually forgotten that I was in a new building without aircon until I moved to the forest. That old building was basically an oven during the summer a few years ago, I ended up using a two-piece cooling system.
But still, you can find a way in 36C heat for a couple of weeks. At 47C, I think it could be bad enough to leave.
Not far enough from Faversham... :) ...where we hit (or were right on) 100F and held the record for a bit (I think the gauge was near Brogdale). The North Downs / Thames corridor seems to have a weird way of being hotter on the north side (Gravesend was 100F as well), than the southern side.
But still, you can find a way in 36C heat for a couple of weeks. At 47C, I think it could be bad enough to leave.