The place of Andrew Mountbatten-Windsor, former prince and brother of the king, in the line of succession to the British throne appears to be under threat in the United Kingdom.

Currently, Mountbatten-Windsor is eighth in line (after the families of princes William and Harry) to the Crowns of the United Kingdom and Australia. This makes it extremely unlikely he would ever become monarch, but his removal is more a symbolic act of repudiation.

Is it possible to remove him? The short answer is yes – but it would most likely be a time-consuming process involving many parliaments passing legislation.

Does the same line of succession apply to the British and Australian Crowns?

At the time of Australia’s federation in 1901, the British Crown was described as “one and indivisible”. Queen Victoria exercised constitutional powers over all her colonies, acting on the advice of British ministers.

That changed after the first world war, due to a series of Imperial Conferences, with the self-governing “dominions” (Australia, Canada, New Zealand, South Africa, the Irish Free State and Newfoundland) having separate Crowns by 1930. This meant the Australian prime minister could advise the monarch about the appointment of the governor-general of Australia and other federal (but not state) Australian matters.

However, the rules of succession to these separate Crowns remained the same. They are a hotch-potch of English laws, including common law rules of inheritance and statutes, such as the Bill of Rights 1689 and the Act of Settlement 1701.

These laws became part of Australian law in the 18th century, but for a long time Australian parliaments had no power to alter them. This changed in 1931 with the enactment of the Statute of Westminster. It gave the dominions power to repeal or alter British laws that........

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