If and when did Abbott renounce British citizenship
The question is easily answered. The Prime Minister’s office tells us he has renounced his British citizenship. It refuses to say when. The fudging and blocking and delaying from both conservative governments, in Australia and Britain, suggest the date will be politically harmful to the Prime Minister.
My guess is that the date he renounced British citizenship is relatively recent and will show that he wilfully, not inadvertently, stood for public office more than once while being ineligible to do so.