Clifford, the David Mack is almost forgotten, even over here. It raised some interest amongst the critics back in the 1960s (Max Harrison wrote an essay on 'David Mack's 'Serial Jazz' at that time in his fine book 'A Jazz Retrospect') but then was promptly forgotten. Good news re: the Ardley though. 'Dejeuner' looks as though it will be re-issued on the dreaded alternative format ( ) sometime over the next year. LP copies are pretty scarce. By the way, I think this one (along with an album by Phil Seamen) was the first and only UK domestic-artist ever put out on vinyl by Verve.
'Dejeuner' by the way is a fantastic album. It starts out with a cracking big band version of Michael Garrick's 'Dusk Fire' and then leads into (IMO) the finest version of Coltrane's 'Naima' other than the one recorded by the Master. Fantastic !