140 Returning to the example of this issue posed by the estate of Walter Charles Atwell being recorded as a member of the partnership at all times from 1976 in circumstances where, until 1998, there were three trustees of the estate of that deceased and since then two trustees, I turn to the terms of the 1976 agreement itself. Each of the original parties to that agreement is identified by name in a manner which treats each interest as being one so that, in respect of this deceased, in the introduction to the agreement the interest is described as 'the trustee of the will of Walter Charles Atwell (dec'd) of the 15th part' and concluding with 'the trustee of the estate of Frank Pusey Atwell (dec'd) of the 20th part'. In the provision for execution each of those 20 parties is to sign and deliver individually so that, in the case of this deceased, the attestation clause is 'The trustee of the will of Walter Charles Atwell, signed, sealed and delivered by the trustee of the will of Walter Charles Atwell in the presence of'. The original of the 1976 agreement makes it clear that, in all probability, the agreement was signed and delivered as a deed by Mrs Elsie F Atwell, and that her signature was duly attested by a witness. However, the document shows that it was also signed by Mr Malcolm Atwell and Mr Ian Atwell, whose signatures were not witnessed and who signed it, as best they can recall, at the request of their mother, on some subsequent occasion, presumably because she thought that it was necessary or desirable. This has been relied upon by counsel for the defendants for a submission that the document was not formally delivered or duly executed as a deed under s 9 of the Property Law Act because of the absence of attestation of the signatures of the two sons. However, I do not accept that submission. Having regard to the structure of the 1976 agreement, and the description of the parties, I consider that it was always intended that only one person would execute, as a deed, the agreement on behalf of his or her interest or the interest which he or she represented and that, in the case of the estate of W C Atwell (dec'd) the approach was to treat the execution of the document by Mrs Atwell as sufficient to bind the estate and to record her, in her capacity as executor or trustee of the estate, as the member of the partnership in the place of the deceased.