I love earl grey its probably my favourite "everyday" tea, especially with toast, or scones or crumpets - but, because its a flavoured tes, I honestly don't worry too much about what I am drinking (unlike "real" tea, where I am a proper purist). I have had the Mariages Freres above, and its certainly very nice, but usually on a daily basis for earl grey I don't sweat the source and I just take fortnum & mason's, M&S or even twinning loose leaf. As long as you are not drinking from bags, most of the big shops can provide a very satisfying cup of earl grey. Perhaps the best tip with EG is to ensure you store it properly in a true airtight flask - as the bergamot tends to loose flavour quite quickly, in most standard packages. Making sure you seal your earl grey well is the simplest and easiest way to ensure a good cuppa.