1/3 g'vine. 1/4 of a lemon. 2/3 schweppes.
I went to a gin bar in newcastle a couple months ago, tried about 10 different gins (ranging from 37.5% - 60%)... some were amazing and some not so much... sadly, I ended up completely hammered and couldn't remember what was what - back to square one, next time I'll take pen and paper!
If not using g'vine, I stick to fever trees (they do a nice elderflower version too).