This is one I reached after a few variations. As served at various fandom meetups.
Zorac's House Special G&T
- 1½oz Bombay Sapphire
- ½oz Gordon's Sloe Gin
- 1 dash Angostura Bitters
- 1 dash Lemon Juice
- 1 dash Lime Juice
Shake and pour into a long glass, top up with Tonic Water.