(1) Subject to subsection (2), a legal requirement for a signature or a seal to be witnessed is satisfied by means of an electronic signature of a witness and is as reliable as is appropriate given the purpose for which, and the circumstances in which, the signature of the witness is required, where—
(a) in the case of the witnessing of a signature, the signature is an electronic signature that complies with section 21; or
(b) in the case of the witnessing of a signature or a seal, the electronic signature of the witness adequately—
(i) identifies the witness, and
(ii) indicates that the signature or seal has been witnessed.
(2) A legal requirement for a signature or seal to be witnessed is not satisfied by means of an electronic signature of a witness unless, the person receiving the electronic signature consents.