With very little hot weather, the UK Met Office says it was the hottest June on record.
UK will have its hottest June on record – Met Office
Heathrow only had one day over 31C and none in the forecast.
Hounslow, United Kingdom 10-Day Weather Forecast | Weather Underground
From June 23 to July 8, 1976 Heathrow was over 31C every day, averaged 32.5C and peaked at 35C on June 26.