The current rules of succession stipulate that a female heir should always be passed over in favor of a male sibling, even if they are younger than her. Furthermore, three hundred and twenty three years after the Glorious Revolution, professing Roman Catholic faith still disqualifies an heir apparent from ascending to the throne. This month the government has set out plans to scrap these anachronistic criteria for the selection of British heads of state. However, as the king or queen of the UK is also the head of state of the 15 other commonwealth countries, David Cameron must achieve extremely broad consensus before change can proceed. Bob Morris of UCL’s Constitution Unit talks to the Huffington Post about why getting these nations to agree to amend their constitutional arrangements might be difficult, complicated and slow.