Murphy must be with me today!
It compiles now and runs, I get the sign-in button, I press it, up pops the please sign in message with sign in with google. I press it, I get a list of accounts on my phone, I select one, press OK, and the gi_Signin method is never called and I'm returned to the sign in with google prompt. So my app doesn't know what account has been selected. This does exactly the same thing on the sample project downloaded from above.
Thanks,
Richard