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"If it was popular, you'd hear about it," like when Pret A Manger changed its subscription service, he says.

For him, "that's cheaper than a Pret or a Starbucks," he says.

In the UK Starbucks will still let non-customers in, but many rivals, including Costa Coffee, Pret a Manger, Waterstones and a large number of independent shops are limiting who can use their loos.

He unveiled his inaugural prêt line for online retailer Jabong in 2014.

The parents of Natasha Ednan-Laperouse - who died in 2016 from an allergic reaction to a Pret a Manger baguette - and Hannah's legal team have urged government action to protect people with food allergies.