You appear to have a problem, and you are making yourself look silly.
What part of Born in Britain, British Parents, Riding for Great Britain, riding for the British Team even living in Briain do you not seem to understand.
As BW clearly put - he is British - FACT.
It does not matter one jot that he would rather be, what his inclination is - he may well wish he was Australian and he may support everything Australian but in the cold light of day - he is BRITISH.
Q.E.D.