Elegant, warming and bursting with ripe tropical fruits, Merser’s Double Barrel proudly continues the tradition of London’s late, great blending houses and the London rum style they pioneered.London’s first rum blending house in over 100 yearsLondon’s first rum blending house in over one hundred years, A marriage of aged Caribbean rums vatted & further matured in London, Distilled in the Caribbean, made in London.