Hi Joe, who did you with in the end?
We went with a firm that did a similar thing for a friend of mine. It is still on going but they are doing a good job. They were cheaper than any of the others mentioned on here but i have had to be quite involved with checking each stage of the works to ensure it is being done to drawings etc so not a firm if you want to just sit back and let them get on with it!
Of the companies we had over to quote from HoL, i was impressed with David O'Doherty who seemed knowledgeble and thorough. But obviously i cant vouch for his work!