I was introduced to Fortnum and Mason about a year ago. Since then it has been all over for me. At the moment, their Jamaican Blue Mountain Estate Coffee is an addiction. Its on the expensive side, but well worth it. As far as tea, their Afternoon tea makes the best iced tea.
I have tried some chocolates and also one of their biscuits(cookies), but I can't remember which. Unparalleled as far as I am concerned. I haven't had the good fortune to visit their store in london, but I have ordered stuff from their US website a number times over the last year.
Anyone else have the fever? i would like to know of other items to try.