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The latitude of which the British Isles straddle (55.3° N; 49°-61° N) is simply far too great for any proper heat on a small, maritime to subpolar maritime island.
Only need to break the heat record by 1.5c to get to 40c. The cold record would need to be broken by 2.8c to get to -30c.
Both 40c and -30c have likely occurred between 1500-1700.
I reckon 43 to 44 C might be reached at Heathrow Airport within the next five years or so, however by around 2040 the world will be a tropical rainforest all over and cloud cover will have dominated every corner of the earth, suppressing heat. This is eventually what will happen according to the peer reviewed literature. Australia will lose its deserts and be green all over (and the AUS Alps will no longer be known for skiing, but instead for surfing); and the Sahara will no longer exist. Warm and wet is the future and that is undeniable.
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