The Australian Financial Review has a useful article on bringing overseas super money back to Australia. He notes that there are some serious restrictions in moving funds from the UK. The superfund here has to be just right and most of them do not qualify. He says that the one that does is the Australian Expatriate Superannuation Fund. https://www.aesf.com.au/
Hughes, Duncan (2021), "How to bring home your overseas super," Australian Financial Review, 4 August, 2021.