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Thanks whiffey, had i actually got a vagina i am sure your link would be extremely useful, saying that there may be one in my loft and that is what is causing my thrush problem. I can't say i have seen one up there but if anyone would like to describe one to me i will pull my finger out and go and have a proper look for one.
Oh and the yoghurt, where you talking fruit or chocolate? Seems a little odd to me but you may have had worse thrush problem than anyone i have heard of.