Yes, the 'Dirty Old Town'is Salford, scene of Ewan MacColl's childhood and adolescence. He wrote the song in 1950 to cover a set change in the Theatre Workshop production of 'Landscape with Chimneys', a Ewan MacColl play. There is a good version of it on 'BLACK & WHITE, EWAN MAcCOLL -THE DEFINITIVE COLLECTION'on Cooking Vinyl Records,COOKCD 038.