Queen's Crescent Market
Queen's Crescent Market is an outdoor street market held every Thursday and Saturday on Queen's Crescent in Kentish Town, Camden between the junction with Malden Road in the West and the junction with Grafton Road in the East. Licences to trade are issued by Camden London Borough Council.

Queen's Crescent Market is an outdoor street market held every Thursday and Saturday on Queen's Crescent in Kentish Town, Camden between the junction with Malden Road in the West and the junction with Grafton Road in the East. Licences to trade are issued by Camden London Borough Council.
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