Big Thank you for your advice and help, You are the Best, My outside drain is blocked solid, Luckily thats covered by my insurance, so they are coming around to unblock it :D
I have moved into a new house a year ago, and only recently when you flush the upstairs toilet water and air starts coming out of the bath, and the water level in the toilet rises.
I have an internal soil stack which is lower then the toilet. I know it should be higher but it is under the...