A company called Good-Win produced a series of budget-priced cardboard jigsaw puzzles of Famous London Scenes - most likely during the mid to late 1950s. There were two sets - the first were numbered 1-4 (Trafalgar Square, Piccadilly Circus, Thames Embankment, Tower Bridge) and the second set were numbered 5-8. The latter being of rather more interest as they all depicted London Markets.
No.6 is Covent Garden Market. It's the only example of the Market Series that I've come across so far. The illustration is a bit rough and ready, though it does capture a flavour of a bustling morning with fruit, vegetables and flowers being carted around the crowded streets.