Waitrose is clamping down on its free coffee for customers offer after it emerged shoppers were abusing the system and picking up cups for their friends. According to The Grocer Magazine the upmarket chain has reportedly lost £150,000 under the scheme which allows myWaitrose loyalty cardholders to take a free coffee or cup of tea when making a purchase. Under the scheme rules customers must purchase something to eat if they want to enjoy their free beverage in the café. But now in some stores shoppers are being told they have to queue at customer services to register their purchases before filling their cups at self-service machines. It comes after it emerged some customers have been going into stores and getting the free coffee for their friends. Since the scheme was brought in the supermarket gives out around a million cups a week across the country.