Ultraframe (UK) Ltd. review: Classic roof

Installed a Classic Roof in a new extension on recommendation from our FENSA registered builder; a bona fida local firm with a good reputation. Also checked out the recommended roof myself referring to the Ultraframe product literature and I quote:
-Weather tested with reference to winds up to 130 mph
-Triple layer storm shield Creating thermally efficient, cosy and stylish rooms.
- The original and most loved glazed roof, tried, tested and trusted, the Ultraframe Classic Roof has been manufactured in Britain for over 35 years with over 2 million roofs produced.
- All Ultraframe roofs are engineered for the extremes of the UK climate.
Sounds good to me, so that's what we've got, as a lantern roof in our extension.
Problem is, when the wind blows, as often it does, especially in winter, we are subject to cold down-draughts and wind noise, also the smell of smoke from a neighbour's wood burning stove.
Keeps the rain out, certainly, but the living area in these conditions is uncomfortable, as you would expect when you have as good as a hole in your roof. Difficult to keep warm and cosy, despite the remainder of the extension having plenty of all round insulation built in.
Ultraframe can't help, won't help, nothing to do with them, not their problem!
They don't have dealings with end users - have to work through 'authorised installers.' Communication not easy. No help forthcoming.
Roof comes with a "Certificate of Authenticity" a meaningless document when it comes down to it; doesn't actually have any value whatsoever.
Disappointed? Certainly, we expected something better in terms of the roof itself and product/customer support.