Aagh! In my kitchen just now, I caught sight - for a second - of a little thing zipping across the floor and behind my freezer. A bit longer than my thumb I think, wider, and dark grey/brown/black. And very fast. I saw it a few days ago but only out of the corner of my eye and thought it was a large spider.
Eek! What could it be? And what can I do about it? Do I need to do anything?