The UK alliance of indiginous peoples

What would the requirement be to join such an association. I know there is an American indian and aboriginal australian version, All indiginous peoples etc, what is their personal history/requirements to belong to such an association I wonder? I was born in the UK as were my parents grand parents and great grand parents, and great great grand parents, would I be suitable to join such a UK association. bearing in mind that I havent set it up yet?