@GeorgeGarside thanks and thanks. For the latter, are you thinking of .sucatalog.gz files?
@GeorgeGarside don't take time out to look, unless you have nothing better to do. (The issue that drove me to ask the question may have been transient.)
@GrahamPerrin I was referring to the list of Software Updates that are available to download in the service preferences in Server.app. Unfortunately it seems that the service uses the 'proper' names rather than the shortened names given by the CLI.
Wonder whether supplemental 1 was very swiftly followed by supplemental 2 to work around update failures for #1 e.g. discussions.apple.com/thread/4419854
… nope, not very swiftly. OS X Mountain Lion 10.8.2 Supplemental Update 2.0 was released around six weeks later.