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.