Cobra Beer has been forced to amend its advertising after a ruling by the Advertising Standards Authority that it was misleading. Objections to the brand's Lessons in Lager campaign, which ran last month, came from rival companies Refresh, UBSN and Carlsberg-Tetley. They complained that the brewer could not substantiate the claims that the beer was less gassy than other lagers and could double beer sales when stocked. Cobra Beer was ordered to change the ads by the advertising watchdog which ruled there was a case to answer. The ruling threatened to disrupt a national campaign featuring the Lessons in Lager advertising scheduled to run in May and June, and again pre-Christmas. To ensure the campaign goes ahead the brewer is changing the ads. A spokesman for Cobra said it is planning to appeal against the ASA judgement. {{DRINKS }}