McDonald's Corporation has reached an agreement to acquire a minority interest in United Kingdom-based Pret A Manger, a quick service food concept that serves mainly sandwiches, snacks and drinks at lunchtime. The new investment will be used to support Pret A Manger's plans for international growth. The founders and existing shareholders, Julian Metcalfe, Sinclair Beecham, Andrew Rolfe and Harvey Smyth, will retain majority ownership and management control of Pret A Manger. Terms of the investment were not disclosed.