We had to wait a long time for it, but today was beautiful. My thermometer recorded a maximum of 22°C, which I suspect is a little too high. I don't reckon it was that warm.
I do think we have had more than our normal ration of horrible cold wet windy days in the past two months and it seems to me that this winter had provided far more frosts than usual, but to describe today as "unbearably hot" is, I think, an attempt to provoke.
Last April was much warmer than this, that I do know. Mrs. Wow and I returned from Scotland a year ago today, suntanned and happy. We cycled the first 600 miles with almost exclusively sunny days (there were just two cloudy mornings I think) and on Sunday 15th April we crossed Bowland and the tar was melting on the road. The day we reached John O'Groats was also beautifully warm and sunny as was the day we cycled north along the Mull of Kintyre. We did have a couple of wet days, but it was never cold.
Edit: looking at Metoffice I think confirms my suspicion that my thermometer is giving an artificially high maximum. Nowhere I looked at in SE England recorded a temperature as high as mine, 20.8°C being the highest I found. Sorry Nutty, if you think a temperature in the high 60s fahrenheit is "Unbearably hot" I suggest you apply for a job monitoring the Antarctic ice shelves for the duration of May, June, July and August.
Edit 2: I spoke to my Shropshire brother today and he confirmed that March 2008 was the wettest he has recorded, going back over 20 years. He records every day the max, min, rainfall and barometric pressure.