sewer smell

We live in a middle terraced house and a while ago we got new neighbours. They had the house re-done including the fitting of we think two new toilets and a new stack. Since then we get periodic sewer smells, sometimes the stench is so disgusting that we have to open all the doors. We’ve had...

Dear Sir's/Madam's (don't want to be sexest) Recently move house, and I am getting "intermittent" drain (egg) smells downstairs! particularly on the floor in the kitchen nearest the stack. There is an AAV (Durgo) fitted to the main stack as image (boxed in besides toilet "upstairs) All other...