"Here the reality at the time of the 'roll-over' was that the bankrupt was many years from retirement age, so that unless his entitlement from the ISAS fund on its termination was 'rolled-over' into another bona fide superannuation fund, the entitlement would have been taxed. Common sense indicates that, to this extent, there was a strong practical incentive, perhaps a practical compulsion, to 'roll-over' the entitlement, an action in fact carried out in this case with the approval of the Australian Taxation Office. Moreover, the dealings in question involved far more than the constitution of a 'bare' trust. The contemplated role of the related assurance company, guaranteed by the fund's trustee, was of fundamental practical importance to the superannuation transaction. In return for premiums received, the fund's trustee promised the beneficiary that the assurance company would provide assurance cover. This involved the provision of a real and truly valuable quid pro quo by the fund's trustee. Those were not nominal, colourable, abnormal or collusive dealings of the kind aimed at by s 120".