(1) The effect of the registration of an instrument is that -

(a) no revocation of the power by the donor shall be valid unless and until the court confirms the revocation under section 12(3);

(b) no disclaimer of the power shall be valid except on notice to the donor and with the consent of the court;

(c) the donor may not extend or restrict the scope of the authority conferred by the instrument and no consent orinstruction given by the donor after registration shall, in the case of a consent, confer any right and, in the case of an instruction, impose or confer any obligation or right on or create any liability of the attorney or other persons having notice of the consent or instruction.

(2) Subsection (1) applies for so long as the instrument is registered whether or not the donor is for the time being mentally capable.