Steve, in your first post you posted a link to a site on ebay selling RGM sill protectors (the photo in the ebay link is from RGM's website).
I've bought three direct from RGM - rearguards.co.uk - and have been very pleased with the service, product, and price. One was matt black for my OH's red VW Up, a silver one for my silver Octavia, and now a carbon effect one for my metallic black Octavia. It's a British company and do all the work in-house. There was even a handwritten sticker with the name of the person who'd finished the moulding. Yes, on the face of it, fifty quid seems a lot for a piece of plastic, but IMHO you won't get better. IMHO.
Usual disclaimers.