As mentioned elsewhere, there’s a long tradition of attending prayers — at church, mosque, synagogue or temple — and then shopping at a market. All over the world the grounds of religious buildings are used for commercial purposes, with the money raised used to support religious structures and social enterprises.
A few miles south of Piccadilly Market is St Mark’s Church Kennington, one of the four “Waterloo” churches built in south London following the defeat of Napoleon at the Battle of Waterloo. Each Saturday in the grounds of St Mark’s is held a thriving farmers’ market:
A market is also held at another of the “Waterloo” churches: St Luke’s in West Norwood: