 Supermarkets are facing disruption to food supplies in the run up to Christmas as more than 700 Bakkavor Group PLC LSE:BAKK factory workers in Lincolnshire plan to walkout from late November. Tesco PLC LSE:TSCO, J Sainsbury PLC LSE:SBRY, Wm Morrison Supermarkets and Marks and Spencer Group PLC LSE:MKS will all be hit when the workers, who make supermarket own brand products including soup, sauces and deli goods, strike from 25 November to 2 January as part of a dispute over pay. 