It may be the Between the Sheets No.3 (with brandy and light rum) that's most identified with this suggestive cocktail's name but as with The Godfather...
Excellent with terrific balance of sweet and sour. The mix of gin and brandy (I used Armagnac de Montal VSOP) blended nicely without either overly predominating. My only comment would be that as much as I am a fan of saline, I only used one drop. I would say that for me that was a good decision as there wasn't really an abundance of sour or bitterness that needed taming and I believe one drop is all that wasI needed to act as a general flavour enhancer.