Twinings Earl Grey - I.ve tried Clipper and supermarket own brands and they're not as good, apart from Carrefour supermarket bio organic ones, but I don't have a local Carrefour in Manchester.
Some of my colleagues were really into 'Yorkshire Tea' and I sometimes took them a box back with me. As this clearly passed the Brit expat test, you might want to give it a try. Two out of three cats recommend it, sorry I mean expats.
Before I made the switch to Earl Grey, back in the days I used to drink milk in my tea, I used to drink Twinings Assam - again, that's 'proper' tea, strong, builders style, but more strong flavoured tea as opposed to strong because it's been brewed too long. If you like a decent strong cup of tea you might like Assam.