British Beer and Pub Association
The BBPA calculates the consumption data from the HMRC Alcohol Bulletins which shows total alcohol released onto the UK market. The figures for beer and spirits are reported by HMRC in pure alcohol terms. For wine and cider average strengths need to be applied, based upon best-available data, to calculate the volume of pure alcohol. The population figures used to calculate per capita consumption are from ONS.
The data will not include alcohol sold illicitly and personal imports from overseas (‘booze-cruising’, duty-free, etc). It also does not account for alcohol that is bought and not consumed, which includes product that goes out-of-date, thrown away, or left in the bottom of a pint glass/bottle/can.