I couldn't help but notice that there wasn't a gin thread in the spirits section.
My favorite drink is gin and tonic and I love Bluecoat Gin.
http://bluecoatgin.com/index.htm
It just won the double gold (absolute best) at San Francisco last year and it is the best gin i have ever tasted. It is actually considered a new genre of gin; american style. American style has significantly heavier citrus notes.
As far as london style my favorites are Hendricks and Tanqueray 10.
If anyone is a gin and tonic fan the best thing I've found to add to it is the liqueur; St. Germain. St. Germain is an elderflower liqueur that essentially turns it into a new drink....if you are a gin fan it absolutely is a must try.