Love "Stagnation", the whole Tresspass album is fantastic, and that was without Hackett and Collins, I also have some of the Ant Phillips solo albums. Phil even sings on a few songs on them.
Phil does a couple of the lead vocals on “Geese and the Ghost”, I’ve had that one on LP and CD, and it remains my fave of AP’s output. He hasn’t held up well for me either, oddly enough. I think Phil sings one on “Nursery Cryme”, maybe “For Absent Friends”?