Funny you brought this up. I was always trying to find a reference of link to a very long thunderstorm that hit here in West Scotland but I think it was late summer 92. I'm surprised I can't find anything about it.
I always remember it as it was a few weeks after I started my first job out of School. I distinctly remember there was on and off thunder all day from about mid-morning till about 9pm and then it developed in to a full blown overnight storm for about 6 hours, then from about 3-4 AM onwards it was intermittent thunderstorms that did not relent until about midday that day.
Quite a spectacular event that I cannot find any references to anywhere.