Hi all, thanks for the replies.
Corgi man did indeed arrive (early) but although he requested the Installers to be present, they didn't send anyone. He contacted them and they explained that they hadn't been able to send anyone due to being short staffed
CORGI guy was here for just over 1.5 hours. He was very thorough and checked everything. He did pick up on a couple of things that the Vaillant guy missed. The gas pipe is undersized and is also too near from an electrical socket so it needs to be 'sleeved'. The drain 'thingy' from the boiler that runs outside should be run to a drain and not just terminating over the path because the stuff that comes out of it is slightly acidic
From his personal view point. he's not happy about the electical wiring for the boiler. He said it has nothing to do with him but he wants me to get it changed because he says it's unsafe ! It actually runs down the wall next to the boiler and enters the boiler from the front. We can't put the bottom (plastic grill thing..) of the boiler on because of it and it has to be moved out of the way to open the drop down door.
He will send a report on his findings and send a copy of it to the installers.
I think it's only fair to let the installers rectify their work so I've no objection to them coming back - I just want my hot water and heating working OK.
I've also had a report back from Fernox about the samples I sent but I don't know how important the info is. It said the system sample was :
'3 = Very turbid or sediment visible ppm = parts per million'
Would that mean that the installers
didn't put any treatment in the system ?
Tryitandsee......the original guy that actually installed the boiler was registered with CORGI because I did check after getting the blue cert.
Thanks to everyone here for the advice x