Navvy Strength Gin from Lea Valley! No, that's not a typo, but the gin was inspired by the navigational engineers (known as 'navvies') that built the reservoirs, canal, and railways in the Lea Valley. In the gin itself you'll find Darjeeling tea, local honey, and lemon peel – like a builder’s tea in gin form! Probably what those navvies would have been drinking, come to think of it.