So all the pipework is concealed. We do have 2 manholes on the front of the property which seem to be flowing/discharging when water from the house is running. Is it worth blasting some water up through the manholes to see if anything dislodges?
In our ensuite, we have been getting issues periodically with the shower drain gurgling when the tap is running. This is then followed by a strong drain/sewage smell which seems to disappear if you run the shower for a few minutes.
This seems to happen every few weeks. We'll go a while with no...