On the only recording I have - which is a compilation from the German 'Interfolk' festival of 1973, which sent Hamish and Iain (separately) on their roads to fame in Germany - 'The Billies and the Sallies' (aka 'The Derry and Cumberland Boys', it seems) is credited to Hamish Imlach. For a number of reasons, I wouldn't be surprised if this was an error (the title may be another one), and wouldn't mind standing corrected. John, I presume your info is reliable?

For the two tenement songs you've mentioned see Jim McLean's song and Adam McNaughtan's song