45 In his affidavit in support of his application the appellant said that he retained his present solicitors in or about June 1997. They obtained his file from his previous solicitors on or about 24 June 1997. Upon examining the entire file his new solicitor advised him that there would probably be other documents held by the respondent which ought properly to be inspected. The inspection ultimately took place on 18 September 1997 following which copies of the relevant files were supplied by the Crown Solicitor's Office to the appellant's solicitors on or about 9 October 1997. The appellant's solicitor then commenced preparing the minute of the proposed amendment to the statement of claim. On or about 27 October 1997 the appellant attended at his solicitors to discuss with detail matters arising out of the minute. The appellant says he carefully went through the documents from the PHRH and the NDH himself, having taken them home from his solicitor's office. It was shortly after this that the appellant's solicitors took up the question of the additional claims with the Crown Solicitor and the Health Department. In my opinion, it is not necessary to establish some kind of "an oversight by the [original] solicitors or some negligence on their part" to constitute reasonable cause. The mere fact that upon there being a complete review of the respondent's files a number of other potential causes of action were discovered is sufficient, in my opinion, to constitute "reasonable cause". It is not necessary to identify any kind of "gross oversight". Her Honour seems to be of the view that a difference of opinion between solicitors with the first not identifying a cause of action, but the latter identifying a cause of action was insufficient to constitute reasonable cause. In this respect, the rejection of the existence of reasonable cause seems to have been closely related to her Honour's characterisation of the additional causes of action and, in particular, those pleaded in pars 14.1.2, 14.1.3 and 14.1.4 as speculative. The amendment allowed by the Full Court deleted par 14.1.3. For the reasons I have already mentioned, there is at least a presumptive inference of causation in relation to the other matters as a result of the extraordinary history and concatenation of events pleaded in the statement of claim and the medical advice received by the appellant from other sources regarding preventative measures. In my opinion, the proposed additional causes of action could not be regarded as "speculative". For these reasons ground 1 is made out.