This is a great drink and very refreshing. I used Beefeaters London Dry Gin, skimped just slightly on the Roses, I prefer dryer drinks in general, but if you like them sweeter, go for it!
Tasty and goes down quickly, but I should have trusted my instinct and reduced the lime cordial. I used Tanqueray Rangpur and was hoping to taste gin, but the citruses overpowered it. As Eva S. said, it's more of a Gin-garita.
Having tried this a couple of times, I have tweaked this recipe a bit and go 1 measure of lime juice and try not to let the ice dilute the cocktail too much. I found the Roses made it a fraction too sweet for me, but I didn't want to lose the lime "hit".