Once I had a little plastic filter which consisted of concentric rings for preventing hair getting into the waste pipe. It sat in the waste, could be lifted out with the aid of a little pip which didn't prevent the insertion of a bung/plug, and did a great job without resticting the water flow very much.
I've spent half an hour plugging various keywords into google and haven't had a single bite.
Does anyone know a source of this little gadget or, at least, a keyword which will yield a productive search?
For personal reflections on aspects of UK contemporary life see:
"Views from the Hills" at