Yes the service from Anglian at the time was good but I suspect it was probably something to do with the fact that it was one of their first big contracts - 60 flats. I wouldn't use them these days. My Niece in Law works for them and even she has used a different company for some doors and windows.
I had my replacement Front Door, French doors and Conservatory done 7 years ago by a small local company who have been working around here since 1985. They did an excellent job and only a couple of weeks ago came to do a small repair in my Conservatory at no charge. It was only some trim that had started to come away but I suppose an hours work for their fitter is priceless in terms of customer satisfaction. They even relaid part of my drive after the skip lorry didn't put packing boards under his jacks and punched holes in the concrete.