Hey andybanks – thanks for that. Just wanted to clarify something before I give them a ring.
If I turn the dial one way should the plug go down by itself? because if I set the screw quite far out then it solves the problem of being able to drain the bath. But it will not descend on it’s own – I need to manually push it down.
However if I have the screw further it, then it descends on its own, but doesn’t have enough length to open the plug enough when the bath is full of water. I think the suction of the water exiting the plug sucks the plug back down.
Any advise would be great as I have the builders coming back tomorrow and I can let them know if the waste trap will need to be replaced.