The Mudlark. The Mudlark was established in the mid 1700's and was named after the people who made a living by collecting items they could sell from the mud on the River Thames. Behind The Mudlark is the Borough Market, on Borough High Street, which is the successor to the one that originally adjoined the end of London Bridge. It was first mentioned in 1276 and is said to be the oldest fruit and vegetable market in London. The present buildings were designed in 1851 with additions added in the 1860's an it has been used as a film set for Bridget Jones's Diary, Lock Stock & Two Smoking Barrels and Harry Potter, Prisoner Of Azkaban.