4. If X has capacity to make an appointment, revocation or declaration under section 79 but is physically unable to make a signature, section 79(2)(a) is replaced by—
“(a)an addition sheet is added to the document containing the appointment, revocation or declaration and the addition sheet must include—
(i)a signature in his or her own name by a person who is unconnected with X;
(ii)a statement by that person that the signature on the addition sheet is on behalf of X and that in his or her opinion X has capacity to make an appointment, revocation or declaration; and
(iii)a signed statement by one witness, in addition to the witness in paragraph (b), who must be unconnected with X stating that in their opinion X—
(aa)understands the effect of the appointment, revocation or declaration; and
(bb)has not been subject to any undue pressure in relation to the appointment, declaration or revocation.”.