As usual, Swanny pontificating on a subject about which he knows nothing bar what the Internet tells him.
For someone who has never been to our country, our city, or our club, he certainly likes to show off how much he thinks he understands about all three.
No - GB is England, Scotland and Wales.
I'm not really sure why we compete as GB&NI (and frequently ignore the NI bit) rather than the UK - The United Kingdom of Great Britain & Northern Ireland.