Here in Leicester I remember the following biggies:
4th June 1982 - massive storm from around 7pm until well after 10pm
18th August, 1996 - shotgun blast of thunder around 9pm followed by an hour of the most intense rainfall I have ever seen. 3ft floods in the street.
28th June, 2012 - lunchtime, barrage of the loudest thunder I have heard, followed by an intense storm and what appeared to be a tornado going through my garden. Similar to storms I have seen in Florida and videos from Kansas.
2019 was the worst - absolutely zero activity wherever I was.