
Gin is a neutral spirit redistilled with botanicals, and by law juniper has to lead. London Dry is the strictest grade: everything it tastes of has to come from the still, not from anything stirred in afterwards.
Any gin works one for one, though the style shifts the flavor. Old Tom is sweeter, so the drink will need a little less syrup. A modern gin that leads with citrus or flowers pushes the juniper back. Vodka is not a substitute: without juniper it is a different drink.
Old Tom gin
A lightly sweetened gin with no legal definition; London dry, by law, may carry no more than a trace of sweetening.
Genever
Gin's Dutch and Belgian ancestor. Oude genever and korenwijn are malty and taste closer to a light whiskey; jonge is lighter and nearer to gin. Oude and korenwijn make a drink maltier and less juniper-led.
The botanical bill and the still itself decide everything here, so two gins made to the same rules can taste quite different — the brand is not a detail in London Dry.
Bee's Knees – IBA
London dry gin