See COVE Master Map entry: https://editions.covecollective.org/place/isleworth

In London Labour and the London Poor edition: 

Phase 1

Of the Street Sellers of Live Birds. (Volume 2): "Of the bird-catchers, including all who reside in Woolwich, Greenwich, Hounslow, Isleworth, Barnet, Uxbridge, and places of similar distance, all working for the London market, there are about 200."