Buying "in season" is often an anathema in Australia
Since when? anathema implies that people are repulsed by the thought of buying in season. That may have been your experience, but I've never come across anything like that. If everything is just cold storage for years why are fruit and vegetables cheaper when they are abundant and in season? Additionally, don't buy at the local supermarkets. Buy from small independent grocers and butchers, which are probably both cheaper and superior quality. My local butcher sell straight from the farm, and the meat is no more expensive than Coles but much better quality, so a smaller quantity satisfies.
I would suggest you look at the cost of registering vehicles, council rates, electrical goods, housing insurance, car insurance, medical insurance (and what it does and mostly doesn't pay for).
Unfortunately one would need a think tank to get an accurate picture. I only know that when I moved out of Sydney (about 55kms from where I previously lived) I ended up paying about 30per cent less for local council rates, about 25per cent less for both car and house insurance, yet my salary remained the same. So comparisons are difficult over a short distance. How do you suggest they be done accurately to do international comparisons? I certainly don't have the skills, or access to information, to do so.
It would be impossible to get an accurate picture without comparing everything you have mentioned as a percentage of net salary. Yes, perhaps a washing machine may be more expensive here than in the UK, but the price tells you nothing. It needs to be seen as some sort a percentage of the average person's spending power.
medical insurance (and what it does and mostly doesn't pay for)
Just by the by, I had a double knee replacement. With private health insurance, it cost me $500. That included a private hospital room, doctor, theatre fees, etc, plus two and a half weeks in a private room at a rehab centre. Waiting period was, I think, four weeks. (by the by, the orthopaedic surgeon only charged the Medicare fee).
but it is not the magical, easy step-up that it used to be for British people moving here.
And why should it be?