All loft insulation was lifted up to lay gas pipe but was not replaced. Access hatch to loft missing and not replaced, so I had to make another one to seal access hole to the loft. I had to pay extra for a vertical flue instead of horizontal flue A hole was made in the ceiling of the cupboard in the bathroom to allow vertical flue to pass through but the hole was roughly made and the size was out of proportion to the circumference of the flue pipe a poor half hearted attempt was made by the fitters to repair the hole but was no good at all. I purchased materials my self to make good the hole. Also each time the boiler is used the condenser pipe drips water. Should have used a local tradesmen instead of an impersonal nationwide firm.