Food miles are big in the food aisles.
In early September, home-grown seasonal fruit and vegetables like apples, onions, carrots and green beans were available throughout the country. But so too, in three central London supermarkets, were apples 4,700 miles from the USA, onions over 12,000 miles from Australia and New Zealand, carrots from South Africa (51,000 miles) and beans from Kenya (3,600miles).