Halliday & Matthiessen (2014: 640-1):
There is a nominal substitute one, plural ones, which functions as Head; it can substitute for any count noun (that is, any noun that is selecting for number, singular or plural); for example,A: But I’ve got a depression quilt at home. – B: You’ve got that one that Marcia gave you. – A: That Marcia gave me from the American. – B: The Amish one, isn’t it?
She’s got she’s got Big Pond which she said which is apparently not a terribly good provider. – No. – Mmm. No. I thought Yahoo was one of the better ones [providers].
I have always had hot water bottles. I think they’re, the last couple disintegrated. I had a nice bright yellow koala shaped one.
There’s reefs around bloody Australia, isn’t there? – Yeah; a Great Barrier one, I believe. – It’s a big one, I think.
With mass nouns, ellipsis is used instead of substitution:Do you want some more wine? White or red [∅: wine]? – White [∅:wine].