A corollary of everywhere in the UK being North of anywhere in the USA (apart from the cheat-code that is Alaska). The UK is just too damn North, and therefore too damn cold (regardless of the Gulf Stream effect) for the heat-exchange that powers big thunderstorms
Except when it's not ,of course. I recall the Great Storm of 1987 [1], being at Imperial College at the time, and seeing the trees fall and hit some of the campus halls. Fortunately, Linstead Hall (there was an immense tree outside my window) wasn't one of them.