Tom, 'The Boys That Broke the Ground' is on Brian's first solo album 'Unstrung Hero' (1985). The words are in the Battlefield Band Songbook. If they aren't in the DT (to find out how to search it go to the FAQ thread at the top) I'll copy them out for you before long and put them here.
As to 'Join the Union' (or 'Sell Your Labour Not Your Soul', the title given on the STUC centenary CD of 1996), I haven't got the words down yet, but I've got the CD and will see what I can do (not very likely before Whitsun, however).