Hi R C,
Suparannuations are classed as pensions for UK purposes and would therefore be taxed as such.
If the tax amount of 65% is based on a visa then you may wish to speak to the home office regarding this.
In terms of how the funds are paid you would need to speak to the fund holders.
Our pension scheme services also deal with pension administrations so they may be able to help further:
Pension schemes
Thank you.