THANKS everybody. I am in Brighton. We have the whole thing opened up loads of times and spent hours repairing it about 2-3 years ago. My friend does not want to go in there again..though and it took us a long time there was a different problem a motor running on ...but this time I am confident...
I am having trouble with a saniflo can anyone help its worked fine till now I ran the tap for a long time...and now it flushes below the water level it used to have. and makes a louder than usual rather awful churning noise as it lurches around rather violently.