we keep getting awful drain smells downstairs in our house, usually originating in the kitchen but now in the hall and sitting room also! The smells have intensified since installing a new kitchen sink. We thought that was the culprit as it seemed to happen when we put a lot of water down the drain or the dishwasher emptied which is also connected to the (****) Ikea trap! We’ve had a plumber come and try and adapt the trap but it’s still happening. We’ve also had Dinorod come and do a camera survey and they found nothing apart from a bend in our pipe under the kitchen, that he unblocked before Xmas but the smell is back already! We’re having our drains unblocked about every three months and it’s getting expensive! We are so careful about what goes down the sink as we’re paranoid about waste build up. I wipe out every pan and plate before washing and we have baskets in the plug hole to catch any remaining debris. Could it be a neighbour at fault and our drains are connected? We just can’t seem to identify the problem, anyone have any ideas?!