I think Oli meant that the coins are slabbed by American companies (ie PCGS etc etc), which if your thinking of the same website that I have recently noticed then yes they are. I don't know of any British slabbing companies (I've heard of US, Canadian and Aussie). You can mention the website by all means, but as not to improve their search engine rankings, don't make the URL clickable! (wicked aren't I). If it's the same one I'm thinking of, I'm actually going to be buying a few of their coins for an investor customer soon. He may as well keep them slabbed, as even if they do look naff, it does help sell them to some people if the coins are 'Guaranteed'. Unfortunately for high grade expensive coins that may well be an increasing thing on the British coin scene. Perhaps the days of true collectors keeping hugely valuable collections in delightful wooden cabinets are waining.