I had the same thought Susan. I keep a close (almost daily) eye on the US EQ occurrences but I thought the UK was seismically quiet and thus not built (building codes) with EQ's in mind.
I happened to catch a programme about this recently, perhaps a repeat of the one Leigh saw. Apparently there is a single tectonic plate under most of Europe, and it has cracks in it due to the Himalayas, and some of those cracks reach to the UK. It's movement along these cracks that produces the occasional small earthquake. If you go back a few hundred years you can find evidence of bigger ones. They are apparently less regular than earthquakes due to tectonic plates rubbing against each other.
We also get tornadoes. I didn't know this until a couple of years ago, when there was a newsworthy one in Birmingham, and there was another in London recently. Proper ones that took the roofs off houses.