(1) Unless expressly prohibited from transferring units of a security by means of any computer based system, a person being a trustee or personal representative shall not be chargeable with a breach of trust or, as the case may be, with default in administering the estate by reason only of the fact that -

(a) for the purpose of acquiring units of a security which that person has the power to acquire in connection with the trust or estate, the units are paid for under arrangements which provide for them to be transferred from a system-member but not to be so transferred until after the payment of the price;

(b) for the purpose of disposing of units of security which that person has power to dispose of in connection with the trust or estate, the units are transferred to a system-member under arrangements which provide that the price is not to be paid until after the transfer is made; or

(c) for the purposes of holding units of a security belonging to the trust or estate in uncertificated form and for transferring title to them by means of a relevant system, that person has become a system-member.

(2) A trustee of a trust deed for securing an issue of debentures shall not be chargeable with a breach of trust by reason only of having consented to an amendment of the trust deed only for the purposes of -

(a) allowing the holding of the debentures in uncertificated form;