I've googled a few threads and the results brought me to this page. Please read my factual account of the torrid time I've had with them and for your stress levels, avoid them!
The sales man was a nice guy and gave a no nonsense one quote, (final figure, no haggling).
The first fitting of the patio door collapsed after 2 weeks. Anglian sent a manager around to make sure this was the case, and several weeks later the doors got re fitted.
Still not 100%, so a further complaint, then a day wasted waiting for the manager to come round again. He then said a service engineer would be in contact ASAP. 3 weeks later, still no contact/appointment.
Eventually a service engineer arrived - he was generally satisfied with the installation, but pointed out minor issues and a part that hadn't been fitted.
Now have to waste yet another day/time waiting for another fitter to come.
All in all, 6 days of hassle, countless emails and phone calls for what SHOULD have been one day's work.
DO NOT USE ANGLIAN!!!