Enjoy your trip Michael. The Address is 74 Charing Cross Road WC2H 0BB. Phone 0207836 7422 (From the UK) Nearest Tube is just across the road, Leicester Square.
I agree, a really good place and probably the last of its type. They are expensive but the occasional good deal comes up, I got a plastic snuff box - just a workaday thing - for £5 a couple of years ago. They also do some good rosewood traditional boxes and handkerchiefs. There is also the snuff and segar parlour at Covent Garden, which is just a few minutes walk. Enjoy
the extra sounds really awesome in my opinion. Even though somehow the regular gletscherprise always hits me as awesome at first then about half way through the tin it becomes the most o.k. snuff ever. Don't really know how that works, though the extra sounds like the bomb.