Australia has held 44 referendums since 1901, but only 8 of them have succeeded. So why are constitutional changes so unpopular? The polling science does provide some insight into why the bar is set so high for these campaigns, and a historical view gives us a hint of what may lay in store for the upcoming vote.

Crucially, this episode also explains exactly what you can and can’t write on your ballot paper to make sure your vote is valid.