I may have mentioned this before but Russian engineers on a visit (during the Soviet era) described PG Tips as "floor sweepings" and I had to bring some of my own, proper tea from home for them.
These days I get Suki's Sencha. Reasonably priced, fair trade, good quality.
I was at U with a member of the Twining family, very nice chap. But I'm not going to tell you what tea he drank because what happens in U, stays in U.