What is the maximum permitted length of stay in the UK per annum of an Australian passport holder?

Australian passport holders can stay in the UK for up to six months per visit without a visa. There is no specific limit on the total number of visits within a year, but frequent or extended stays may raise questions about the purpose of the visits and could lead to scrutiny by Immigration officials. It's important for travelers to ensure they comply with the rules to avoid any issues at the border.