Despite my GPS indicating this carpet of flowers is in Isaacs (I wish!), they are on the Farrer side of Yamba Drive, but probably outside of the Nature Reserve boundary.
Thanks Michael, That's close enough. They are actually between that line of trees and the road, exactly where those big mowers tend to 'tidy up' the road verge...
I have moved them again, to where the other sightings were, and changed the ID to Leucochrysum albicans var. tricolor. A lovely sight so close to the road. I'll have to check them out next time I go past !