Recently whilst changing my lights for the rear registration plate I lost my screw! Looked all over the internet to find a replacement and found nothing so I hope this post will help others. As promised see the picture attached showing the size screw I used.

These are slightly longer but fit well & also Stainless steal (Shouldn't rust) I purchased these from B&Q

Forgot to mention - These are nearly £6 a bag so look after them!

http://www.ebay.co.uk/itm/No4-x-1-2-2-9x13mm-PAN-HEAD-SELF-TAPPING-SCREWS-A4-STAINLESS-STEEL-10-PACK-/290675127106?pt=UK_DIY_Material_Nails_Fixing_MJ&hash=item43ad967342

These the same diameter and type. £1.28 delivered for a pack of 10

B and Q are rip off merchants for fixings and the like.