I had wonderful tea on Azerbaijan airways, just to digress slightly. Served in a cut glass beaker. Azerbaijan is particularly good for tea - when I think of Azerbaijan I think of tea (and Ladas driven at high speed over precarious dirt tracks by gleeful maniacs, but that's a story for another day); I received many stern warnings not to add milk which I would never have done, but you use a piece of sweet fruit preserve held in your mouth to sweeten it.

There is incidentally a great section in Erika Fatland's "High" all about tea. If you haven't already discovered her books, "Sovietistan", "The Border", and "High", they're about the best travel books I know.

BA tea in F is of course a great business class tea.