Last time I was in the UK (for more than a fleeting visit) it had the "wrong kind of snow". Now it seems its got the "wrong kind of sun". The search continues, presumably, for that elusive 2-degree-either-way temperature band that only occurs during one week each year, that represents comfort. Here, rather further south, things are far more predictable ... "summer" happens between April and August, the latter being sufficiently hot for the locals to clear off in every direction, leaving the edges of their country for the rest of Europe to play with. In September it will rain a couple of times, in buckets. Between October and March the weather might be "cold", possibly as low as 10C, but when that happens we just huddle in our sitting room (around the bonfire that doubles as a cooker) until "summer" once more returns.
On a more serious note (well, slightly!) it is possible to get used to extreme heat, but it needs to persist for long enough for that to happen. Fat chance in Blighty I say!!!