We've had a few carpenters come and go in the past, but the best yet has been the London Alcove Company.
Cameron is the proprietor. Everything is bespoke of which the standard and quality is absolutely top notch. They've built a lovely walk in wardrobe for us, and as of yesterday they've just completed a bespoke home office, 3 alcove units, a tv unit and a storage cupboard for us.
Really good guys who cleaned up after themselves each day, and even went above and beyond my expectations with attention to detail.
I would highly recomend. http://www.londonalcove.com/index.html