Rishi Sunak has been heckled during a beer festival visit where he was seeking to promote a shake-up of the alcohol duty regime that will hike tax on a range of drinks.“Prime Minister, oh the irony that you’re raising alcohol duty on the day that you’re pulling a pint,” publican Rudi Keyser yelled, as Mr Sunak toured the Great British Beer Festival in London on Tuesday.Mr Sunak had been insisting businesses and consumers will benefit from the post-Brexit alcohol duty changes, despite the raises on wine, vodka and canned beer.First set out by Mr Sunak when he was chancellor in 2021, the new system aims to encourage drinkers to cut back by taxing all alcohol based on its strength, rather than the previous categories of wine, beer, spirits, and ciders.