Seeing as we're all ditching trad tea in favour of herbal, here's a recommendation for you: Hampstead Tea & Coffee. It recently usurped my old herbal stalwart, Clipper, on the grounds that it's not only organic, but FairTrade too. The Peppermint one also tastes superb and comes with dinky strings for teaspoon-free frolics. To get a piece of this infusion action, try Fresh and Wild or goto Hampstead's website and give them a bell for a local stockist.
I also drink the Hamstead peppermint tea. More recently I discovered Dragonfly with their stunning organic Redbush and Honeybush teas:
http://www.dragonflyteas.com/