I was three years old when I went to Australia with mum and dad however I am now 21 and just returned with mum and family back to United Kingdom. I am living with my grandparents and now I find it hard to get passport. NHS number register for a doctor and leave my driving license as it is Australian passport authorities now saying because I am 21. My birth certificate doesn’t mean nothing so I know am I to register as a British citizen? I was born in this country. My mum and dad were born in this country. My grandparents are born in this country and yet I am up all the trouble , to access my Australian bank account as I cannot open a bank account in the UK