They first met fighting over properties more than three decades ago. Retailer Justin King had just bought Haagen-Dazs to the UK, and kept clashing over new leases for his ice cream parlours with an upstart named Julian Metcalfe who was opening a string of sandwich shops called Pret a Manger.

Now the so-called King of Retail and the man who changed the way Britons eat lunch by bringing posh sandwiches and sushi to the mainstream are uniting to fill the world’s kitchens with £100 million worth of Itsu groceries.

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