The following link tries to list (among other things) Andy's sideman appearances (see also the thumbnails for Phil & The Explorers at the foot of the page):
http://theexplorers.interfree.it/mackay.htmWhile the following offers support for SB's point about Andy & Mott's GAORR:
http://www.discogs.com/Mott-The-Hoople- ... ase/571322