Found much of it pretty hard - I'd be confident of telling a modern subsurface line from a deep one, or the Jubilee (which to me at least has a very distinct motor sound), but for lots of the others I was guessing - sometimes with luck though, apparently.
A bit deep to put district and circle as options on the same question. Don’t they use the same rolling stock and cover very similar stations?
I found Bakerloo was the easiest to identify.
After being in Paris over the weekend the state of the underground cleanliness/noise is just absolutely shameful.