In reply to jkarran:
Most of my work these days involves being on a keyboard or phone. I come into no contact with anything mechanical or the like work related. I have though even given the keyboard a good hoover in case it was something in there from production.
They look very similar to some splinters I got once from a corroded bolt when replacing the loo seat except they are absolutely straight and finer. 0.25mm I would say is the largest I have found them, I can only get them out with the tweezers on my penknife. I washed any tools I used when I noticed this as well as us cleaning the floor thoroughly many times since and neither of us has had any in a foot past the first week after that. I've looked for anything else in the bathroom that was fitted at the same time to see if it is something similar.