https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings#?id=7fbed77a-dae0-4693-8a24-12c349657221&details&referrer=app&date=2023-06-18
The Met Office have issued a very widespread thunderstorm warning for Sunday. The coverage of the warning reflects uncertainty as to where storms will crop up. Not everywhere will see storms of course.
Main risk: torrential rain.
This weekend marks a transition to unsettled, but generally very warm period, with muggy nights, but temperatures lower than they have been. Further rainy periods and perhaps storms are expected.