Pret A Manger offers discount for customers who bring in reusable cups
A sandwich chain is offering discounts to customers who opt not to use paper cups.
Pret A Manger bosses say they will cut 25p off the price of hot drinks to people who bring in reusable cups.
Earlier this year researchers suggested charging for disposable coffee cups.
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Hide AdAcademics at Cardiff University estimated that 2.5 billion disposable coffee cups were used in the UK every year - and about 25,000 tonnes of waste created.
They said a study showed that charging might cut the use of disposable cups by up to 300 million a year.