Waitrose is reintroducing disposable cups for customers coming in to claim their free in-store coffee. The high-end supermarket has launched the trial at 10 of its stores for the first time in six years. Stores involved in the trial include Bagshot, Newton Mearns, Edgware Road, Kingshill, Sheffield, Balham, Coham, Maidenhead and Sudbury. The supermarket has not yet confirmed if it will extend the trial after the initial 12 weeks. This means shoppers with a MyWaitrose loyalty card can claim their free drinks without having to bring their own cups. They will be required to scan their loyalty car…