The Met Office has published a study that shows that one of the impact of climate change is going to be that heatwaves like the one we saw in 2018 occur more frequently.
The odds of a heatwave in any given year are around 1/2 of 1 percent at present, but their predictions are that heatwaves will be thirty times more likely to happen. The probability of a heatwave will be 12%, ie. one in every 8 years.
The concern around heat waves arises because of the impact on a wide range of areas – agriculture, transport and especially health. There was a spike in deaths around the hottest portion of the heatwave in June, according to the Office for National Statistics, with older people most at risk – see this report in the Guardian.
There is a report on the BBC website that shows temperature data in the UK for the last hundred years – as well as steps we can all take to reduce the impact we have as individuals on the climate.