If potential buyers have the original media to install from, you should leave it to them to install it themselves, or else you're profiting by charging buyers for installing software that they might not actually own:
"If you have own original copies of any OS, I can install it for you on the SD card, for £5"
How do you prove they actually own the software requested, short of posting their disks / media to you? Emailing you an image of their media would not necessarily suffice as proof.
From this, I imagine it is against the rules of this site/forum to offer this 'service' due to (potentially) illegal copying / distribution of software (in this case, Workbench) with no proof of ownership by buyers beforehand. AFAIK, sellers here have to sell Amiga machines or other items with the original software / media if they are installed and detailed in the listings (eg. Workbench on a hard drive must also come with the original disks), so your listed item here (and any other SD cards, CF cards or anything else like these) that you offer to install Workbench for buyers should follow the same rules. In my opinion, this aspect should be removed from the listing.
Selling these cards new, blank or formatted ready for use in Amiga machines is absolutely fine, but you shouldn't be offering a Workbench installation service unless buyers post their media to you first, as it is still under copyright, which I'm sure you're aware of. I guess the posting of original discs is, in most cases, impractical or unnecessary for most buyers, as they probably have the original media to install from anyway, so you're not losing out. If the mods can prove me wrong, then I will slink away with my tail between my legs.
However, I noticed a mod has bought a CF card with OS pre-installed from you in a different thread (a 8GB CF card with OS installed). I thought they knew better.
