Saying that I just looked at the lists and they are so much bollocks.
Australia and New Zealand are on the green list. All good apart from the fact that those countries have sealed their borders so no chance of going there until this time next year.
Also, you have to take the status of the trip from the rating of any country you transit through. From my memory you can get to the UK from Oz via Tokyo, Singapore, Hong Kong, Kuala Lumpur, Bangkok, Dubai and Qatar and the States if you want to go the long way round. All of those countries are Amber or Red in the case of UAE. So what is the point in having Australia on the green list at all?