Navy Strength Gin from the Winchester Distillery's Hampshire Gin range, created using an interesting combination of sea buckthron and gunpowder tea alongside the classic juniper. Gunpower will still ignite if spilled over gunpowder if it's 57% (or so the story goes), which is why spirits were often that strength when taken on Naval ships, and this is where the Navy Strength terminology comes from. Using gunpowder tea is a neat connection these Hampshire-based distillers have made. Kudos.
57%