Be aware that you will have to get lucky to make a proper cup of tea. Most of them supply slightly different blends to different areas of the country depending on how hard the water is.

I think that's really only Yorkshire Tea - I listened to an obituary of Warren Ford (the man behind the brand) and everyone remarked on his exceptional tasting and mixing abilities. Making hard water tea was his idea. I'm not sure the average punter could tell the difference unless they have their brewing set-up absolutely top-notch. Even then I don't think anyone would complain over something like that. But you never know.