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Hi Spleurker, I did get it resolved, but I think in my case it was possibly a bit of careless plumbing that caused the problem. It turned out that the guy who installed the shower tray had lifted the waste pipe to put a better fall on it. He'd done this by simply choking up the pipe on some...

Thanks again Softus. To be honest I can't really tell you what the pipework configuration is, as I didn't see it before the shower tray went in. And with it being recessed there's no access to it. All I can tell is that the outlet for the trap is facing the opposite way to where the soil stack...

Thanks Softus. He was able to increase the angle of fall without moving the connection to the soil stack, he just put a block underneath the pipe near to the shower tray to lift it further away from the ceiling of the room below. The shower tray is recessed into the floor, so there's not a lot...

Thanks for that. This certainly sounds like what's happenning. So what would the remedy be ? All he did was increase the drop in the waste - the other one had almost no drop at all - but I can't think why that would create an air lock ?

I've recently had a replacement en-suite shower installed with a fast flow trap. The plumber increased the angle of the drain for a better flow (not that there was a problem with the old one). But the new shower doesn't drain, unless you break the seal of the trap - at which point a load of air...