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Thanks for that - not something I had considered... I assume that any leakage would've come through the ceiling below. If it isn't leaking now, is it likely to start by me creating an external air vent, and thereby changing the pressures in the existing pipework? Thanks in advance.

Hi all, Parents had a 2nd floor bathroom fitted a couple of years back, and have subsequently started having some pretty vile smells coming through. I imagine it is sewer gases rather than a ''user issue"! My dad said that there was an AAV fitted (possibly under the floor?), which means that it...