Sourced some fixings today from these guys today so thought I'd post their contact details on the forum:
Margnor (Fasteners) Limited
36 Stringers Avenue
Home page - Margnor-Online
Really helpful and knowledgeable. Bought some fixings to replace the duff ones on my Underbody Tray/Shield. Please see attached pictures.
As well as having a shop they also do mail order as well so if your not local they can still help.
We use them to supply our fixings at my work. Nice to see a small local company which has not been swallowed up by Srewfix etc.
They apparently have a lot of home mechanics and kit car builders as customers.