Yep, I have no issues with the quotes. Everyone I asked quoted £9500 for 2 windows, to within £200 so that's defo the price.
Roughly I would guess £2000 materials, 70 hours @ £35ph, £1000 to fit. Margin 50%, +VAT = £9810
As I'm not working, I don't really want to spend £50k on someone else to...