Stratford Market
Stratford Market was a wholesale fruit and vegetable market, located in Stratford in the London Borough of Newham. Opened in 1879 by the Great Eastern Railway as a competitor to Spitalfields Market in the City of London, the market closed in 1991 and consolidated at the New Spitalfields Market in Leyton. The site is now home to Stratford Market Depot.

Stratford Market was a wholesale fruit and vegetable market, located in Stratford in the London Borough of Newham. Opened in 1879 by the Great Eastern Railway as a competitor to Spitalfields Market in the City of London, the market closed in 1991 and consolidated at the New Spitalfields Market in Leyton. The site is now home to Stratford Market Depot.
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