Provided you're happy with the price, I'd recommend Anglian. Over time, we've had a conservatory, double glazing, patio door and soffits/facias from them. Very impressed with their after sales support. Eight years into our conservatory, we had a rep round for a quote for double glazing and he noticed the pattern in the 'lead lights' had faded. We hadn't noticed that ourselves and within a couple of weeks they had replaced all 8 panels with a different design of our choice. (And no, we didn't buy the double glazing at that time.) Later, we had the front door replaced because of some minor delamination in one of the frames. By all means check out local suppliers/get recommendations but don't pass over any money without some form of guarantee. The industry is notorious for failures (as one local couple has just found out, losing £12,000 of hard earned savings).