Atul Shah, the chief executive of east African retailer Nakumatt, is in the middle of an animated discussion with Olympic medallist Paul Tergat. Over a pot of English breakfast tea, Shah is telling his fellow Kenyan – who held the world marathon record between 2003 and 2007 – that they’ve got a lot of work to do. There are many people to speak to, to get on board, says Shah, if his vision is to be realised.