Turns out this was a bit of a 'red herring'... don't have a link now but you could try searching BBC archives.
Dedy
From: c.ten.broeke_mail.chello.nl <<Btw did anyone read about the traces of Prozac in the UKdrinkingwater? Apparently over a third!!! of the people take Prozac and through the urine it shows up in the water.>>...