Thanks for the reply, yes toilets all fine. Remove the trap and see if I can't get to the blockage from there.Definitely sounds like a blockage only outlet doing it toilets fine ?
Thank you, I'll try that.First off take the shower head off and use the shower pipe at full volume directly into the trap, take off any restrictions like a hair trap first. I have to jet wash my shower pipe from outside at least twice/year due to low fall and soap accumulation, you may need to do the same?
Reply to the thread, titled "Bubbling shower trap" which is posted in Showers and Wetrooms Advice on Electricians Forums.