31 While it appears that at some stage the respondent did engage Saraceni to provide services beyond certification work under cl 2.10, as her Honour observed, it is not clear when that occurred and, in particular, it is not clear whether it occurred before or some time after the modification of the design. In affidavits filed on behalf of the appellant, a former employee of Saraceni, Mr Thomsett, and a former employee of the respondent, Mr Fitzgerald, each said that in February 2006 the respondent had engaged Saraceni to provide contract administration services, including structural queries, in addition to structural certification work under cl 10.2. On the other side, Mr Tobias, a director of the respondent, said that he had to approve any contract with Saraceni and that at the relevant time Saraceni was engaged by the respondent only for the purposes of certification work under cl 2.10 of the contract. Whilst there were email communications between the parties confirming Saraceni's appointment to provide the respondent with contract administration services, those emails were exchanged some time later, in June 2006, and do not identify precisely when Saraceni was so appointed.