“… in this Act “items subject to legal privilege” means: (a) communications between a professional legal adviser and his client to any person representing his client made in connection with the giving of legal advice to the client; (b) communications between a professional legal adviser and his client or any person representing his client or between such an adviser or his client or any such representative and any other person made in connection with or in contemplation of legal proceedings and for the purpose of such proceedings; and …”
“The second category of legal professional privilege [i.e. litigation privilege] is wider than the first [i.e. legal advice privilege] but arises only when litigation is in prospect or pending. From that moment on, any communications between the client and his solicitor or agent or between one of them and a third party will be privileged if they come into existence for the sole or dominant purpose of either giving or getting advice in regard to the litigation or collecting evidence for use in the litigation. This is the basis for claiming privilege for correspondence with witnesses of fact or experts and proofs, reports or documents generated by them.”
“The question in this case is whether or not the principle applies to expert witnesses. They may have been told the substance of a party’s case. They may have been given a great deal of confidential information on it. They may have given advice to the party. Does the rule apply to such a case? Many of the communications between the solicitor and the expert witness will be privileged. They are protected by legal professional privilege. They cannot be communicated to the court except with the consent of the party concerned. That means that a great deal of the communications between the expert witness and the lawyer cannot be given in evidence to the court. If questions are asked about it, then it would be the duty of the judge to protect the witness (and he would) by disallowing any questions which infringed the rule about legal professional privilege or the rule protecting information given in confidence – unless, of course, it was one of those rare cases which come to the courts from time to time where in spite of privilege or confidence the court does order a witness to give further evidence. Subject to that qualification, it seems to me that an expert witness falls into the same position as a witness of fact. The court is entitled, in order to ascertain the truth, to have the actual facts which he has observed adduced before it and to have his independent opinion on those facts. … In this particular case the court is entitled to have the independent opinion of the expert witness on those documents and on those facts – excluding, as I have said, any of the other communications which passed when the expert witness was being instructed or employed by the other side. Subject to that exception, it seems to me (and I would agree with the judge upon this) that the expert witness is in the same position when he is speaking as to the facts he has observed and is giving his own independent opinion on them, no matter by which side he is instructed.”
“As Lord Denning M.R. had said, the general principle must be that no party has any property in a witness; and the argument before us has partly involved a discussion as to whether there is a difference between a witness of fact and an expert. In my view, there is no difference between those two kinds of witnesses as a matter of general rule. Were it otherwise, as Lord Denning M.R. has indicated, in a sphere of a small number of specialists it might be possible for one party to buy up all the possible experts, and clearly such a situation is not right. … The safeguard against an expert witness giving evidence on more than one side is the existence of professional privilege, …”
“… the rule is that in the case of expert witnesses legal professional privilege attaches to confidential communications between the solicitor and the expert, but it does not attach to the chattels or documents upon which the expert based his opinion, nor to the independent opinion of the expert himself.”