Anyone with lathe turning skills in west midlands

[spaceboy]

Hi All

Looking for someone who can or who knows someone that can, make a threaded aluminium reducer / adapter out of a 4" billet ??? I have some limited skills and a hobby lathe but it's beyond both and would rather find someone more capable to do the job within the west midlands area and thought I'd see if there are any local to me astronomers up for the challenge. Main reason for asking rather than hitting the yellow pages head on also being an astronomer would already have a good idea of what I need to achieve in making the adapter in the first place so any errors in my design may be picked up, not to mention the battle of explaining the reason for it would already be won  

Thanks in advance!