A between-subjects randomised controlled trial, in online purchasing context. Participants were adults (n=737) over the age of 18, who regularly purchased alcohol online. Participants were randomised to one of three groups varying in the proportions of alcoholic vs. Non-alcoholic drinks i. ‘25% non-alcoholic/75% alcoholic’; ii. ‘50% non-alcoholic/50% alcoholic’; iii. ‘75% non-alcoholic/25% alcoholic’ Participants completed a shopping task, they selected drinks in a simulated online supermarket, before purchasing them in an actual online supermarket The primary outcome was the number of alcohol units selected (with intention to purchase); secondary outcomes included actual purchasing. A readme.txt file has been included.