Second The London Alcove Company owned and run by a chap called Cameron.
We used them based on the 5 star reviews on TrustPilot and they are true to their word. We initially got them in to do some alcove units for us and we were so impressed with the quality that we asked them back and they have since built a bespoke walk in wardrobe, home office and a tv cabinet which all looks fantastic and still going strong (they offer a lifetime guarantee).
Great company with excellent workmanship. We wouldn't use anyone else now.