I bear in mind the clarity of the language of section 1(2) and (3) and also that the requirement for attestation is integral to the requirement for signature in that the validity of the signature is stipulated to depend on the presence of the attesting witness. I also accept that attestation has a purpose in that it limits the scope for disputes as to whether the document was signed and the circumstances in which it was signed. The beneficial effect of the requirement for attestation of the signature in the manner specified in the statute is not in question. It gives some, but not complete, protection to other parties to the deed who can have more confidence in the genuineness of the signature by reason of the attestation. It gives some, but not complete, protection to a potential signatory who may be under a disability, either permanent or temporary. A person may aver in opposition to his own deed that he was induced to execute it by fraud, misrepresentation or (as was unsuccessfully alleged in the present case) duress and the attestation requirement is a safeguard.
I have however come to the conclusion that there was no statutory intention to exclude the operation of an estoppel in all circumstances or in circumstances such as the present. The perceived need for formality in the case of a deed requires a signature and a document cannot be a deed in the absence of a signature. I can detect no social policy which requires the person attesting the signature to be present when the document is signed. The attestation is at one stage removed from the imperative out of which the need for formality arises. It is not fundamental to the public interest, which is in the requirement for a signature. Failure to comply with the additional formality of attestation should not in itself prevent a party into whose possession an apparently valid deed has come from alleging that the signatory should not be permitted to rely on the absence of attestation in his presence. It should not permit a person to escape the consequences of an apparently valid deed he has signed, representing that he has done so in the presence of an attesting witness, merely by claiming that in fact the attesting witness was not present at the time of signature. The fact that the requirements are partly for the protection of the signatory makes it less likely that Parliament intended that the need for them could in all circumstances be used to defeat the claim of another party.
Having regard to the purposes for which deeds are used and indeed in some cases required, and the long term obligations which deeds will often create, there are policy reasons for not permitting a party to escape his obligations under the deed by reason of a defect, however minor, in the way his signature was attested. The possible adverse consequences if a signatory could, months or years later, disclaim liability upon a purported deed, which he had signed and delivered, on the mere ground that his signature had not been attested in his presence, are obvious. The lack of proper attestation will be peculiarly within the knowledge of the signatory and, as Sir Christopher Slade observed in the course of argument, will often not be within the knowledge of the other parties.