Hi Simon, Had a look at those on e bay. They look ok to me certainly the ones from shops based in UK should be fine. The ones i looked at last May were not from a shop.
I have Opticron Imagic 8x42 and i'm very happy with them. In fact all my gear is Opticron you can't go wrong with them really.
Simon, I seem to remember there being some negative stuff about these Discovery bins on e bay. When i bought my Imagics about 6 months ago i did the same as you're doing now and posted for advice. I think there was some things said on Birdforum to the effect that they weren't the genuine article. I remember seeing them on e bay and decided to give them a wide berth. This was in May last year so it might not be the same seller but check them out thoroughly before buying. Sorry to be negative but don't be disappointed with optics for the sake of a few quid
Does anyone have any experience of using the opticron discovery (8X42 WP PC)seen on ebay for cheaper than shop, i'm interested in getting theese as they are pretty small and compact I already have a pair of nikon actions (8X40) but there not waterproof and pretty clumsy when walking about...