Dutch brewer Grolsch has warned the British market is under "severe pressure".
The warning came as Grolsch, subject of a takeover bid from SAB Miller, announced its annual results for 2007.
Volumes in the British market, which Grolsch runs in a joint venture with Coors, declined by 10% overall.
It said: "The joint venture with Coors in the United Kingdom experienced another difficult year, with volume declining by more than 10% and a slightly reduced market share in the premium lager segment, a segment that is currently under severe pressure."
The news is further confirmation of the tough market conditions due to the smoking ban, rising input costs and increases in tax on beer.
Analyst Mark Brumby of Blue Oar Securities estimated that beer volumes were down 9.7% in November while the British Beer and Pub Association said sales had dropped to their lowest level since the Great Depression of the 1930s.
Overall, Grolsch reported a 5% increase in turnover on last year with net profit up 19%.