I installed our bath, toilet and sink. The sink and bath have the usual
U-bend plumbing pieces as does the toilet (built in).

Every now and again there is a horrible smell in the bathroom like rotten
eggs. No its not my wife ;o) It can sometimes be there for a couple of days
and then disappears again.

I thought the U bends would stop all smells. Is there anything I can try to
eradicate the problem.

Cheers

Steven.