If I have a choice, Glengettie in the morning and during the day, Twinings Earl Grey in the afternoon and evening.
I\'ll make do with PG tips, however, as they come in ridiculously huge boxes and last me a while, even at the rate at which I drink tea! It\'s not impossible to buy tea in Germany, but your choices are: affordable-but-nasty stuff in small packets, nice high-quality stuff from expensive specialist shops or expensive-import stuff from English speciality shops.
The Brits in my office get together periodically and order \"proper\" British products from a handy website called www.britishcornershop.co.uk. Their maximum weight allowance is 30kg, so we split that between whoever wants in. I ordered about 4 different kinds of tea the first time I was in on the order!