How to acquire British citizenship
British citizenship can be acquired automatically, by operation of law, at birth. This is the case where you were born in the UK and at the time of your birth at least one parent was a British citizen or settled in the UK.
If you were born in the UK, but at the time of your birth none of your parents were British or settled in the UK, you are entitled to be registered as a British citizen if, while you are a minor, any of your parents becomes British, or settled, or a member of the armed forces.
If you were born in the UK, at the time of your birth none of your parents were British or settled in the UK, and while you are a minor none of your parents becomes British or settled, you may be entitled to be registered as a British citizen if you have attained the age of 10 years, and as regards each of the first 10 years of your life, the number of days on which you were absent from the UK in that year does not exceed 90.
If you are at least 18 years old and you meet the requirements, you may naturalise as a British citizen. Requirements are slightly different if you are or not married to or in a civil partnership with a British citizen.
If you want to apply for British citizenship or for a British passport and need specialist advice, feel free to contact me. Please note that I am an accredited immigration adviser, not an employee of the UK Visas and Immigration. I charge fees for the advice provided.