I have a reference to "the Basic Latin character set used by ISO Standards Catalogue 01.140.10" and I need to know the exact set of code points.
Without going through all the standards found in Standards Catalogue 01.140.10 can I find this Basic Latin character set somewhere (preferably reasonably authoritative)?
Is it "Latin-1", ISO 8859-1, etc.? Or something entirely different?
Yes, LATIN-1
is the ISO-8859-1
character set.
Here's an "authorative" link from ISO web site, although it seems you have to buy it:
https://www.iso.org/standard/28245.html
I would be comfortable taking any of the links from wikipedia or google search as authorative (take your pick):
https://en.wikipedia.org/wiki/Western_Latin_character_sets_(computing)