I used to drink Jacksons of Picadilly. It was the best. Then Twinings bought them and it's nearly impossible to get now. I think they scaled down production to a hard to get boutique brand. It's even hard to find in the UK. I do not have kind feelings toward Twinings as a result.
I gave up and now order F&M in large quantities every year or so. It isn't cheap, but I figure it's comparable to drinking good coffee. There is no good Earl Grey tea sold in the U.S. Williamson's is very good, too, but they have also had issues with supply. I don't know if you can still get it. The loose leaf tea is available in the UK, but not, as far as I know, in the U.S.