I (and a few others on here) use Doug Taylor's in Weston-Super-Mare (near Bristol). Doug chromed my new school retro SE Quadangle frame and forks and charged me £160. He did all of the preparation work so all I had to do was drop the frame and forks off and collect it.
Turn around time is 4 weeks (which is pretty quick).
You can go to his website by clicking the www (globe) icon underneath my Arsenal avatar.
Here is a picture of his work. You can also see another picture of my bike in the Photo Display section of Doug's website.