If Tom Walsh and Graeme Blevins only joined them at the pub, but they didn't recorded, there is a big chance that they (the rest of the band) could had been recorded the songs for the Local Hero Musical cd, as the band members would fit with the instruments of all those songs, and that would explain why Guy can say anything about it.
But at the same time, from Richard's post, I understand that they recorded new MK songs, so maybe they are already recording a new record, and as far as the previous one is not released yet Guy can say a thing, because I don't see any problem in saying those new songs are to be considered for the "already" mixed and mastered record, with records like GH or STP we've been told that MK wanted to record new songs for the record without problem.