This was the reply:
I would be happy to advise but unfortunately our Credit Control Committee will not permit me to undertake any further work whilst there are invoices outstanding. My letter to you dated 29 January 2015 refers.
I am trying to decipher The ACTAPS Practice Guidance for the Resolution of Probate and Trust Disputes ("The ACTAPS Code")
3.15 Parties should consider the use of jointly instructed experts so far as possible. Accordingly before any prospective party (the first party) instructs an expert he should (unless of the opinion that another party will want to instruct his own expert) give the other (second) party a list of the name(s) of one or more experts in the relevant discipline whom he considers are suitable to instruct.
3.16 Within 14 days the second party may indicate an objection to one or more of such experts and suggest alternatives. The first party should then instruct a mutually acceptable expert.
3.17 If an expert to be jointly instructed is not agreed, the parties may then instruct experts of their own choice. It would be for the court to decide subsequently, if proceedings are issued, whether either party had acted unreasonably. No party shall be entitled to instruct an expert proposed in a list of experts for joint instructions until it is clear that joint instructions cannot be agreed and thereafter the party who submitted the list of experts shall be entitled to nominate one of the experts on this list as his own chosen expert and no other party shall instruct any expert named on the list until such nomination has taken place.
3.18 If the second party does not object to an expert nominated, he shall not be entitled to rely on his own expert evidence within that particular discipline unless:
(1) the court so directs, or
(2) the first party's expert report has been amended and the first party is not prepared to disclose the original report.
3.19 Either party may send to the expert written questions on the report, relevant to the issues, via the first party's solicitors. The expert should send answers to the question separately and directly to each party.
3.20 The cost of the report from an agreed expert will usually be paid by the party first proposing that a joint expert be instructed. The costs of the expert replying to questions will usually be borne by the party asking the questions. The ultimate liability for costs will be determined by the Court.