I did put the manufacturer, part number and an idea of its location in B&Q on the "other" website if it's any help
I've got carried away this morning and gone for the complete german setup that Albie pointed me towards.
As for colour, you've got a photo of my silver mesh above and Abie's on another thread, which may help you make up your mind. Just make sure you buy ally mesh and not the steel one!
Pity you didn't make it over the Sharnbrook yesterday...