Can anyone advise me of a company that could quote for replacing a large 16 feet wide by 12 feet deep roof window consisting of 8 double glazed panes - each 2 feet x 12 feet - all set on aluminium frames and bearers and sloping at 45 degrees with water runoff to a gutter. This seems to be too difficult for some of the glaziers I have contacted. Grateful for any guidance on who might be able to tackle it. Location is London NW3. Thanks.