Finished at last, after much consideration on what to leave standard and what to change...
Kidney grills painted in sapphire black by Teddy at SSDD - fantastic service, highly recommended.
Grey spoiler mesh removed and replaced after a few coats of halford BMW black sapphire, followed by any old Halfords laquer. To replace the spolier mesh you need to remove the whole front bumper - there is a great guide on how to do this here -
http://www.n54tech.com/forums/showthread.php?t=132. Be warned, it will take you 2-3 hours, even with a friend! Mesh can be ordered from BMW at £13 per section (3 sections).
Harp, if you're reading, do you plan to make any changes to your new bad boy, or keep everything standard?