Trace amounts of alcohol have been found in some varieties of their chips, but no mention of this is made on the package label. Alcohol can be used as a carrying agent for flavorings, and is found in trace amounts in some products. A Walkers spokesperson said trace amounts of alcohol is believed to be permissible for Muslims. However, the Muslim community still feels it should be informed when even a minute amount of alcohol is contained in a food.
Source: http://www.dailymail.co.uk