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Just checked the screws. Yesterday I tightened them all up pretty much as far as I was physically able to. Today, the two screws at the front I was easily able to put another full turn. It feels like they have slacked off. This is all going very strange, and I may just plump for the Mcalpine SK1a trap and do the whole lot.

From the pictures, have I got push-fit, compression or solvent weld piping?
 
Bloody hell jon you've over tightened it slightly.
You don't need to tighten it so both clamps meet, The top clamp has a o ring that seals it when just hand tight.
 
Bloody hell jon you've over tightened it slightly.
You don't need to tighten it so both clamps meet, The top clamp has a o ring that seals it when just hand tight.

Any mileage in slackening it off? Will the pipe regain its shape or stay deformed?
 
Possibly the pipe is not 40mm. Sometimes it slightly bigger. If you have a 1 1/2 push fit fitting, use it to test.
 

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