Hello and welcome to
APFFN. I have moved your thread to a more appropriate forum (Collector's Corner).
Yes, "The Man & The Journey" has been recorded, there are several bootlegs out there with recordings, some better, some worse.
"Childhood's End" has also been played live and it's available at quite a few bootlegs. Try searching google for
site:pf-roio.de "childhood's end" (or click
here), and you should get details on a few of these, from the excellent Pink Floyd RoIO Database, the premier source for information on Pink Floyd bootlegs.