So a few years back at a party, I had a Classic Pimm's. The way we mixed it was with equal measures of lemonade and Pimm's. I finally found it in the local liquor stores again, and I wanted to try it again, but when I did some research online, I found out that British recipes calling for "lemonade" typically don't mean lemonade as an American thinks of it - lemon juice, water and sugar. They refer to a citrus-y soda, like Sprite. I found a recipe that sounded quite good and called for Ginger Ale and a splash of Lemon, and was pleasantly surprised by the results. Now, since I understand that the classic Pimm's is a pretty common affair in the UK, I'm sure someone has the definitive "best" recipe for it.
Also, I hear that Pimm's No. 6 is good, albeit not available in the US. Has anyone had it? Is it worth me trying to find someplace and get shipped to the US?
Look for Winter Pimms - generally served hot and tastes gorgeous when it's cold out.