Finally solved the riddle,
Answer From eBid
Sun 07 Oct 2007 00:22:44 (BST)
The original photo on the listing showed the back of the tax disc holders only. This photo has now been replaced to show both sides. On the front, that's the part that faces out the windscreen, there is a clear pocket for the tax disc. The logo is above the clear pocket and it in no way interferes with or conceals the disc.
That's ok then.