Shagnasty:
I have heard that as well but I don’t think we are talking about nearly the same class of tornadoes that occur over much of the U.S. Those are the ones that can destroy your house in the middle of the night, suck up your entire family and then fling your car a few streets over.
A more reasonable index is Fujita scale of which the strongest tornado I could find for the UK was and F2. That is nothing to laugh about but tornadoes much stronger than that hit somewhere in the U.S. many times a month during the warm seasons.
I don’t think any Brit is going to claim British tornadoes are in the same league as American mega-tornadoes. It’s just a bit of useless trivia.
You’re right. The ones we have here generally last a minute or two and (when they happen near human dwellings) might damage a rickety shed, collapse an ageing chimney or knock over a plastic lawn chair.