[skissane]

> Australians who have a British parent or grandparent and can thus get a UK passport would number in the millions

Generally speaking, a British grandparent does not get you UK citizenship, only a British parent does. (There are various obscure exceptions to that generalisation, but they don't apply to the vast majority of cases.)

[sien]

True, it's not citizenship, but a British grandparent gets you the right to work in the UK which can then get you a British passport.