Just had ours done at The Wheel Specialist in Fareham, extremely happy, by no means the cheapest around but their quality of workmanship is brilliant so I'm happy to pay more. I was so pleased I left my other car there to have its wheels also refurbed.
Pics are near the bottom of the thread:
http://www.z4-forum.com/forum/viewtopic.php?f=6&p=781264