I have seen these weird bugs on my toilet floor, and no matter how much I clean it they are still there, UI don't know what they are or what they are called, but here is a picture of what it kind of looks like...
from the shape its larvae, dropped from holding and empty shell. From your description - flown off to reproduce in your comfortable warm/dampish b'toom ;)
Do they move really fast? Could be silver fish. I have seen one in my bathroom once every so often. Try and clean surfaces with cif every week. Wipe shower/bath splashes down. They do moult every so often so might not have silvery scales yet. According to wiki, they are harmless but best to do above cleaning. Specially in dark corners. Vacumn every week as they can feed on dead skin cells. Urghhh!
Yes they do move really fast but they are not silver like the silverfish, they are seethroughish/greyish/blackish... never seen it before, and since I moved to this flat they are all over my toilet floor, no matter how often I clean... I hate thems o much...
Yeh I have managed to see where they are coming from... and I am going to bloke every bit... I just was really curious as to what they are, I cannot find anything anywhere it's crazy...