New Delhi (CNN Business)One of the world's richest men is launching Pret A Manger in India, adding the British coffee and sandwich store brand to a huge business empire that spans energy, retail and telecommunications.

A unit of Mukesh Ambani's conglomerate Reliance Industries said on Thursday that it has entered into a "long-term master franchise partnership" with Pret A Manger and will "launch and build the brand in India."