Better quality built homes should mean there should be "few difficulties".
Miller Homes state their own Customer Satisafction survey scores are high too.
There are far worse house builders in this country than Miller Homes imo.
The NHBC "quality" Awards are, in my opinion, little other than subjectively assessed 'top of' site manager charts which do not necessarily indicate total compliance with NHBC Technical Standards and the requirements of Building Regulations. I speak from a position of intimate knowledge.
My offer of assistance is specifically in relation to Miller Homes in Scotland where in my experience the standards have not been met across a number of developments. Should you have anything to add to this thread of a factual nature then I would be delighted to hear it.