We were very happy with Graham MacRae joinery. They installed 3 x conservation velux for us after ripping out all of the lathe and plaster board in our old cottage. They insulated the whole roof space and re-plaster boarded it. Very flexible with our changes/questions (thanks!), always tidy and great communication about time scales / schedules etc. I would definitely use again, the local (Highland) velux experts I'd say.