Bass' move to help drinkers avoid hangovers by reducing the strength of its popular Caffrey's beer has triggered a surge in sales, the brewer has revealed. It cut the strength of the brew from 4.8% abv to 4.2% in May after drinkers said they stinted themselves because of fears of the morning after'. But Bass said that new figures showed that consumption of Caffrey's in both the on and off-trades had gone up by 18% since the relaunch. To maintain momentum the brewer is backing the brand with a £500,000 advertising campaign, including posters at London Tube stations, on bus stops and by main routes in cities in England and Wales. {{DRINKS }}