Factual Background
8On 24 June 2005 and 14 July 2005, Mrs Haroun suffered separate injuries in the course of her employment by RailCorp. She subsequently made claims for lump sum compensation arising out of those injuries based upon an assessment of whole person impairment. A dispute between RailCorp and Mrs Haroun as to the extent of her impairment was originally referred for assessment to Dr Edward Schutz, an approved medical specialist under the Management Act. On 22 November 2006, Dr Schutz provided a certificate of assessment of whole person impairment of 1% for the injury on 24 June 2005 and of whole person impairment of 1% for the injury on 14 July 2005. On appeal to the Medical Appeal Panel (MAP), those assessments were confirmed.
9Mrs Haroun brought proceedings in the Supreme Court seeking judicial review of the decision of the MAP. Those proceedings were dismissed and an appeal from that dismissal to the Court of Appeal was unsuccessful. On 29 June 2007, the Commission determined Mrs Haroun's lump sum entitlements in accordance with Dr Schutz's assessments and made orders accordingly. RailCorp paid the compensation due under those orders.
10Subsequently, Mrs Haroun made a claim for further lump sum compensation. RailCorp denied that claim on 19 May 2011 and, on 7 September 2011, Mrs Haroun lodged an application with the Commission for the medical dispute that had thus arisen to be dealt with under s 321. That required the Registrar to refer the dispute to an approved medical specialist for assessment.
11On 20 September 2011, RailCorp proposed that Dr Schutz be appointed as the approved medical specialist for the purposes of the dispute notified on 7 September 2011. At 12.48pm on 29 September 2011, Mrs Haroun's solicitors sent a facsimile to the Registrar saying that they were instructed to oppose the request by RailCorp to have the medical dispute referred to Dr Schutz as the approved medical specialist. The facsimile asserted that, in the absence of agreement between the parties, Mrs Haroun was entitled to attend an approved medical specialist appointed by the Registrar and was not bound to return to the same approved medical specialist who had assessed her previously.
12At 1.50pm on 29 September 2011, a delegate of the Registrar sent an email to the solicitors for Mrs Haroun and the solicitors for RailCorp attaching a proposed referral to Dr Schutz for assessment of Mrs Haroun's permanent impairment. The email said that any objection to the referral as framed should be lodged and served within seven days.
13By email sent at 2.01pm on 29 September 2011, Mrs Haroun's solicitors responded to the Registrar's delegate, reiterating that Mrs Haroun objected to having the matter referred to Dr Schutz and requesting the Commission to make a random allocation of an approved medical specialist to examine her. By email sent to the Registrar's delegate at 2.24pm, RailCorp's solicitor said that the referral should be to Dr Schutz, as the claim was in respect of deterioration subsequent to the previous medical assessment certificate and, on that basis, Dr Schutz was in the best position to assess the claim. RailCorp's solicitors asserted that Mrs Haroun should provide reasons as to why she objected to the referral to Dr Schutz.
14At 3.32pm on 29 September 2011, the Registrar's delegate sent a further email to the parties' solicitors, saying that it was the practice of the Registrar, where a claim for deterioration resulting in permanent impairment is made, to refer the matter back to the same approved medical specialist as had previously been appointed, to ensure consistency and fairness. The delegate noted that the previous assessment by Dr Schutz as to permanent impairment had been the subject of an appeal but that his assessment had been confirmed on appeal.
15The 3.32pm email said that, in circumstances where there were no submissions made as to why Dr Schutz was unable to make an assessment, and the parties had not reached agreement as to the appointment of an approved medical specialist, the Registrar was required to appoint the approved medical specialist. The email then said:
The Registrar appoints Dr Schutz in accordance with standard practice.
Clearly enough, that email constituted an exercise of the power conferred by s 321(2).
16At 10.24am on 30 September 2011, Mrs Haroun's solicitors sent another email to the Registrar's delegate asserting that, during the previous examination conducted by Dr Schutz, the conduct of Dr Schutz had been unprofessional. Five reasons were given for that assertion. The email then asserted that Mrs Haroun had lost confidence in Dr Schutz and in the accuracy of his findings at the previous examination. The email then submitted that, on the basis of the reasons then given, the Registrar "should reconsider referring the matter to be re-examined by [Dr Schutz]".
17At 12.09pm on 30 September 2011, the Registrar's delegate responded by email to Mrs Haroun's solicitors, saying that the issues raised effectively amounted to a complaint regarding the conduct of Dr Schutz. The delegate asked whether that was the first time those issues had been raised, noting that the earlier examination had taken place almost five years previously. The email said that further consideration to the request would be given "upon your response".
18Mrs Haroun's solicitors replied by email at 1.59pm on 30 September 2011, saying that Mrs Haroun had had a "bad experience" with Dr Schutz and did not see why she should have to see him again. The solicitors asserted that Mrs Haroun was not required to do so and asked whether the Registrar required sworn evidence from her regarding the complaints. The solicitors said that, should that be necessary, they would obtain sworn evidence from Mrs Haroun. The email ended with a request that the Registrar "please reconsider having the matter referred to [Dr Schutz]".
19At 2.51pm on 30 September 2011, the Registrar's delegate responded by email to the 1.59pm email from Mrs Haroun's solicitors. That email said that a "statutory determination" had been made to appoint Dr Schutz as the approved medical specialist to determine the medical dispute in the matter. The email asserted that, once the appointment of an approved medical specialist had been made, it was "not open" to the Registrar to change it simply on the basis of an application by one party, "in the absence of an appropriate legal basis to do so". The email asserted that:
on the information provided, there is no legal basis upon which the decision to appoint Dr Schutz as AMS [approved medical specialist], should be altered.
20The 2.51pm email went on to refer to "WorkCover Guidelines" that made it clear that Mrs Haroun was entitled to be accompanied to the examination with Dr Schutz by a support person and suggested that that was a course that she may wish to consider. The email said that, alternatively, if Mrs Haroun was able to reach an agreement with RailCorp regarding the appointment of an alternative approved medical specialist within seven days, the Registrar would appoint that approved medical specialist.
21The decision evidenced by the email at 2.51pm on 30 September 2011 was not expressly impugned by the parties in the proceedings at first instance. However, the primary judge concluded that the decision was invalid in so far as the Registrar failed to take into account that there was in fact an appropriate legal basis for altering the decision to appoint Dr Schutz, and thus he fell into jurisdictional error by mistakenly denying his power to reconsider an earlier decision. RailCorp contended that it was denied procedural fairness in relation to the determination by the primary judge that that decision was invalid, since that decision had not been put in issue in RailCorp's summons. It will be necessary to return to that question.
22On 6 October 2011, the Registrar's delegate notified the solicitors for both parties that an appointment had been arranged for Mrs Haroun to be assessed by Dr Schutz on 3 November 2011. The communication requested Mrs Haroun to attend the examination promptly and to take with her any relevant medical reports relating to her claim against RailCorp.
23On 1 November 2011, Mrs Haroun's solicitors wrote to the Registrar, referring to the scheduled appointment with Dr Schutz on 3 November 2011. The letter asserted that, on the last occasion when Mrs Haroun was seen by Dr Schutz, she found him to be "both unprofessional and uncomfortable to be around". The letter made more specific allegations concerning Dr Schutz's conduct towards Mrs Haroun at that previous examination, and attached a statement dated 23 October 2011 signed by Mrs Haroun, outlining in more detail incidents that she alleged had occurred on that day. The letter said that Mrs Haroun was "extremely adamant" about not wanting to see Dr Schutz after her previous experiences and requested the Registrar to consider making an alteration to the approved medical specialist by whom Mrs Haroun was to be examined.
24At 2.35pm on 2 November 2011, the Registrar's delegate sent an email to Mrs Haroun's solicitors in response to the letter of 1 November 2011, explaining that it was the Commission's practice to have further loss claims assessed by the same approved medical specialist where possible. The email referred to the Registrar's email of 30 September 2011 inviting the parties to agree on an alternative approved medical specialist to conduct the examination. The delegate continued by observing that no further correspondence had been received until 1 November 2011, when particulars of Mrs Haroun's complaints against Dr Schutz were provided to the Commission for the first time. The delegate said that, while the Registrar had the ability to investigate complaints against approved medical specialists, the passage of five years since the initial examination arguably made any investigation impractical at that point. The email ended by saying that Mrs Haroun should attend the appointment scheduled for the following day.
25By email sent at 2.44pm on 2 November 2011, Mrs Haroun's solicitors responded to the delegate's email of 2.35pm, saying that they were instructed that Mrs Haroun would not attend the examination with Dr Schutz the following day. The email said that, given the circumstances "as conveyed in some detail already", the Commission "could quite easily of its own accord show some degree of flexibility" in selecting an alternative doctor. The email urgently sought "your reconsideration and some degree of compassion".
26At 3.47pm on 2 November 2011, the Registrar's delegate sent a further email to both parties' solicitors, saying that, in light of the advice from Mrs Haroun's solicitors that she would not attend the examination on the following day, the Commission had cancelled the appointment with Dr Schutz "to avoid any unnecessary inconvenience" to him. The email went on to say that, "as a means of progressing this matter in a timely fashion", the Registrar proposed to appoint Dr Philippa Harvey-Sutton to examine Mrs Haroun. The email said that a revised referral document would be issued shortly and that an appointment could be made for 14 December 2011. The email ended by asking both parties whether the proposed appointment was acceptable to them.
27At 4.23pm on 2 November 2011, the solicitors for RailCorp sent an email to the Registrar's delegate objecting to the referral to Dr Harvey-Sutton and saying that it was RailCorp's position that, as the matter was in respect of a claim for deterioration since the previous medical assessment certificate, Dr Schutz was in the best position to assess the claim. RailCorp's email observed that that was the usual procedure of the Commission and that no evidence had been provided by Mrs Haroun that should change the usual procedure.
28RailCorp's email of 4.23pm also observed that the complaints in respect of the earlier assessment "are five years out of time" and that Mrs Haroun had not provided any statement as to her complaints about the initial examination. The email said that, if Mrs Haroun had complaints against Dr Schutz at the time of the initial assessment, she would be expected to have made complaints to the Registrar at the time or to have included such complaints in the appeal to the MAP and in the related proceedings in the Supreme Court and the Court of Appeal. The email said that RailCorp strongly objected to the referral to Dr Schutz being cancelled and to the further referral to Dr Harvey-Sutton. RailCorp submitted that Mrs Haroun should be required to attend the appointment with Dr Schutz.
29At some time on 2 November 2011 after 4.23pm, RailCorp's solicitors were provided with a copy of the letter of 1 November 2011 from Mrs Haroun's solicitors together with the statement signed by Mrs Haroun. At 9.04am on 4 November 2011, RailCorp's solicitors sent an email to Mrs Haroun's solicitors and the Registrar's delegate indicating that RailCorp had now received the signed statement from Mrs Haroun. The email submitted that, having regard to the seriousness of the complaints, Mrs Haroun should file and serve a sworn affidavit. It is significant that RailCorp's solicitors did not suggest that the matters dealt with in the statement signed by Mrs Haroun would not justify revoking the decision to refer the dispute to Dr Schutz. The only complaint appears to have been that Mrs Haroun had not sworn to the correctness of her complaints.
30On 7 November 2011, the Registrar wrote to both parties' solicitors, referring to the previous correspondence, and confirming that the signed statement from Mrs Haroun dated 23 October 2011 had been received, together with the submissions in reply from RailCorp. The Registrar said that the allegations contained in Mrs Haroun's statement were very serious and that the only way to determine whether the complaints could be substantiated was to conduct an investigation. The Registrar said that an investigation would be commenced shortly but that, in order to allow the dispute to proceed and not be delayed by the investigation, a determination had been made that the examination should be conducted by Dr Harvey-Sutton.
31An amended referral for assessment by Dr Harvey-Sutton of the degree of permanent impairment of Mrs Haroun was issued on 9 November 2011. On 3 January 2012, Dr Harvey-Sutton provided a medical assessment certificate, in which she certified a whole person impairment of 4% for the first injury and whole person impairment of 11% for the second injury.
32On 31 January 2012, RailCorp lodged an application to appeal to the MAP against the decision of Dr Harvey-Sutton. On 23 February 2012, Mrs Haroun filed a notice of opposition to any such appeal. On 9 March 2012, a delegate of the Registrar made a decision that none of the grounds of appeal as specified in s 327(3) had been made out by RailCorp and that the appeal was not to proceed.