Ok plumbing novice here chaps so excuse my ignorance - I have one of those plastic corner showers with jets on the back wall and a shower head. It worked fine for several months but then suddenly my wife noticed water all over the bathroom floor which then dripped through the ceiling to the downstairs study. So I assumed the basin wasn't sealed correctly and resealed it thoroughly - seemed to be ok for a couple of weeks but then leaked again but not so bad this time - just a little water seaping out from the bottom of the basin - any ideas? Waste outflow leak? Def only does it when the shower is used.