Thanks for responses. They decided to board it in the end. I asked about using plasterboard but they said it was alright they are using marine plywood!
I'm not happy as after sorting out the wall everything afterwards felt a bit rushed. The installer was saying that he wished they didn't book jobs on a Friday as he has to make sure everthing is done on the day as he won't be able to come back again until the Monday.
BG don't routinely do a poweflush on new boiler installations only system cleanse with chemicals. I wouldn't know if it was done or not but the box on form has been ticked by a BG installer so must believe it was.
The thing though is that I had a magna filter costing me over £200 put on the old boiler at insistence of BG otherwise I may not have been covered under the Homecare agreement for particular boiler problems.
I just assumed that it would be kept and attached to new boiler. Only realised yesterday after installer left that it has been taken away. Reading the manual it recommends fitting one and I believe the fitter should have reused it or told me why not.
Oh and not to forget the white plastic condensate pipe that I thought was just a bit dirty and would clean off. No. Dirt marks are scratched into the plastic and I can't get them out.
Then there is the free Boiler and central heating Homecare for a year.
Homecare entitles you to a yearly service and call outs for breakdowns.
Just been told by BG customer services that they serviced the boiler when it was installed. Excuse me but i don't consider a boiler being installed as being, or needing to be, "serviced". I expected it to be serviced in the middle of or towards the end of its first year. I think BG are being very disingenuous.
I'm beginning to think that I should have listened to others on this site and got new boiler from someplace else other than BG.