LONDON/SYDNEY, Feb 23 (Reuters) - Australian Prime Minister Anthony Albanese said he would back plans to remove Andrew Mountbatten-Windsor from the line of succession to the British throne in a letter he sent to UK Prime Minister Keir Starmer's office. Any changes to the succession to the throne have to be approved not just in Britain but also in the other realms. In a statement on Tuesday, New Zealand Prime Minister Christopher Luxon's office said his government would support any proposal to remove Mountbatten-Windsor from the order of succession. The last time changes were made to the line of succession came in 2013, when a law was passed to end a 300-year-old system that gave precedence to male heirs. The British government has said any change would follow the completion of a police investigation.