Scheme segregation requires separate accounts, prohibits commingling, and mandates trustees to apply realisations for redemption and returns. A special purpose distinct entity may offer securitised debt instruments via schemes and must maintain separate accounts for each scheme, prohibiting commingling of asset pools or realisations. Trustees and the entity must ensure realisations are applied to redemption, payment of returns, or other permissible scheme expenditure. The terms may allow a clean-up call option subject to adequate disclosure, and any expenses beyond those specified as allowable in the scheme shall be borne by the trustees.