To prove the point, his previous London venture, Penny University, was a six-seat coffee bar that only served a changing menu of three different filter coffees.

BBC: Exploring London��s coffee crescent

Just as three drink sizes and various types of coffees, milks and syrups became the core ingredients that people could customise to suit their own tastes, so Vivanno is aiming to take Starbucks into the smoothie trade (popularised by Jamba Juice) without greatly altering its production methods.

ECONOMIST: Innovative things to do with a banana