New Spitalfields Market
New Spitalfields Market is a fruit and vegetable market on a 31-acre (13 ha) site in Leyton, London Borough of Waltham Forest. Located in East London, the market is owned and administered by the City of London Corporation. The market is Europe's leading horticultural market specialising in exotic fruit and vegetables - and the largest revenue earning wholesale market in the UK.

New Spitalfields Market is a fruit and vegetable market on a 31-acre (13 ha) site in Leyton, London Borough of Waltham Forest. Located in East London, the market is owned and administered by the City of London Corporation. The market is Europe's leading horticultural market specialising in exotic fruit and vegetables - and the largest revenue earning wholesale market in the UK.
Check the official site before travelling; hours and prices can change.
More markets

Borough Market
London's defining food market — go early Saturday, eat your way around the perimeter.

Columbia Road Flower Market
Sunday-only flower market in the East End — 8 a.m. for choice, 2 p.m. for prices.

Maltby Street Market
Borough's smaller, scruffier sibling — railway arches, weekend only.
Source: wiki-list