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Raise the cylinder and use 28mm pipe work

Temperature drop, valve has opened. Use the shut down cap supplied with the thermostatic valve or a 15mm blanking end

Joules

Chopping board

I would be more concerned about removal of timbers within the loft if that what has been done

Remove all and regauge battens My concern also is how they have set out the eave course

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Copper disc are for imitation slate which are pre holed. Your roof has been done wrong

Well I have never done a slate roof where the slates are not on the batten, I don't know the consequences. Should have used slate and a half on the verge. Has he installed soakers on the abutment side, normally ally or code 3 lead.did he mentioned ventilation at eaves or high level or insulation...

Is there a reason why the top of the slates are not on the bottom of the battens?

Will look it up. The reason for it is for safe isolation

Or even unswitched

Think the regs are unstitched socket

Try to cut the lead pipe square, clean the outside of the pipe, you may have to file the pipe down a bit to get lead loc on. Normally 7 or 9lb Probably 7lb

Wishing you all the best Conny

Air seperator

It could be air lock around the cylinder. Post photos of cylinder and pipe work

Manufacturer instructions overide British standard

Undo the screw's