We used a company called Premier Blinds on the Byres Road before but their phone line seems to be dead. They were cheap supplying blinds for 4 rooms (including a bay window), for about £270 and that included 2 black-out blinds, safety ties and measuring and installation (this is after many, many years of buying at IKEA and bodging installing ourselves!)
So can anyone recommend a reasonably-priced company that will come out and quote?