13.
The decision in The decision in Stanton was given on 8 July 1998. It was a successful appeal by a defendant against the refusal of the Deputy High Court Judge to strike out a claim against him. The defendant was a Structural Engineer who had been retained to advise in an insurance claim as to the propriety of previous partial underpinning work that had been performed upon the plaintiff's house. The defendant had advised that total underpinning was required. The insurance company's expert concluded that a suitable and cheaper alternative remedy was available, namely infilling with polystyrene. At a joint expert's meeting the defendant changed the view that he had previously intimated and accepted that polystyrene infilling was a suitable alternative. In the circumstances the case settled for less than the claimants had originally been advised was appropriate. A number of alternative claims were made against the Defendant in the proceedings that he faced, including that it had been his original advice that was flawed, and/or that he should not have amended his position without consultation with the plaintiff retaining him. The factual basis for the assertion that his final amended view was negligent was uncertain, but as this was a strike out claim it proceeded upon the basis that it was true.
14. Chadwick LJ reviewed the authorities on witness immunity in an extensive judgment between pages 88B and 102C. It is pertinent to observe that at the start of that review, however, he said the following:
"The proposition that the defendants can escape liability for negligence on the ground that Mr Callaghan's advice as to the feasibility of the gap solution as a remedy for subsidence was given in the context of litigation requires careful scrutiny. Mr Callaghan was a professional man who undertook, for reward, to provide advice within his expertise. The expectation of those who engaged him must have been that he would exercise the care and attention appropriate to what he was engaged to do. I would find it difficult to accept that Mr Callaghan did not share that expectation. But for the fact that he was a potential witness in pending proceedings, there could be no doubt that the law would provide a remedy, if that expectation was not fulfilled. But, equally, there can be no doubt that the law does recognise immunity from suit in relation to certain things done, or omitted to be done, in the course of preparing for or taking part in a trial. It does so, on the basis of a supervening public interest, which transcends the need to provide a remedy in the individual case."
15.
A similar view as to the primary liability in negligence of an expert retained by a party in litigation was taken both by Mr Simon Tuckey QC when sitting as a Deputy Judge of the Queen's Bench Division in the case of Palmer v Durnford Ford [1992] QB 483 and Bingham LJ (as he then was) in Hughes v Lloyd's Bank [1998] PIQR 98. In both these cases, however, the judges concluded that the negligence was in respect of defects in the initial report and advice and had not taken place at a later stage of the case where it could be said to be akin to challenge of court testimony of a witness.
16. In the review that Chadwick LJ then conducted, reliance was placed on the long line of authorities reviewed by Simon Brown LJ (as he then was) in Silcott v Commissioner of Police for the Metropolis (1996) 8 Admin LR 633 where the immunity of a witness from suit in respect of evidence given in court was described as a fundamental rule of law. Where it exists, the immunity is absolute and will not even be defeated by evidence of malice. It extends to witness statements and expert reports made in contemplation of criminal or civil proceedings. These principles are not weakened by the fact that Silcott , concerning the position of a police witness who is alleged to have lied, was itself subsequently overruled by Darker v Commissioner of Police for the Metropolis [2001] 1 AC 435 itself decided a week after Arthur Hall.
17. However, in contra-distinction to the issue in Stanton, I observe that many of the authorities cited were dealing with the situation where a party seeks to sue a witness or expert called by an opposing party in proceedings brought against him or her. Thus, in Watson v Jones (1905) AC 480, the suit was for slander brought by a litigant in separation proceedings for what the witness is alleged to have told the opposing parties' solicitor before he went in to the witness box. In Evans v The London Hospital's Medical College (University of London) [1981] 1WLR 184, Drake J struck out proceedings brought against a pathologist for negligent preparation of a report that led to criminal proceedings being brought against the claimant. In Taylor v The Serious Fraud Office (1999) 2AC 177, the claimants sought to sue in defamation an employee of the SFO in respect of correspondence written whilst investigating allegations of fraud by a client of the claimants. Upholding the immunity from suit in that case, Lord Hoffmann observed at 215E:
"Actions for defamation and for conspiracy to give false evidence plainly fall within the policy of the immunity and actions for malicious prosecution fall outside it. In between there is some disputed ground. In Evans v London Hospital Medical College , Drake J held that a contributory reliance on a statement in an action for negligence in which it was alleged that a carelessly prepared post mortem had led to the plaintiff being unjustifiably arrested and charged with murder. I express no view on this case, which I think might nowadays have been decided on the ground that the Defendants owed the plaintiff no duty of care ." (Emphasis supplied).
Such considerations do not apply where the person to be sued for negligence is retained by the Claimant under a contract for reward in which there is generally an actionable duty of care.
18.
Chadwick LJ in Stanton recognised that other grounds mentioned in the authorities as the basis for an immunity, including the need to ensure that potential witnesses are not deterred from coming forward and the need to avoid a multiplicity of actions, appear to have little or no relevance in the present context (101B). He, therefore, concluded:
"In my view the only ground of public policy that can be relied upon as the foundation for immunity in respect of the content of an expert's report, in circumstances where no trial takes place and the Expert does not give evidence is that identified by Lord Morris of Borth-Y-Gest in Rondell v Worsley [1969] 1AC 191 and referred to by Lord Diplock in Saif Ali v Sidney Mitchell and Co [1980] AC 198 222B: 'It has always been the policy of the law to ensure that trials are conducted without avoidable strains, intentions of alarm and fear'."
19.
In his concurring judgment Otton LJ( at 102G – 104C, 107E – 108F) also relied on the principles in Saif Ali v Sidney Mitchell and Co and the public policy reasons for upholding advocates' immunity from suit for negligence. Such reliance was both to identify a good reason for the immunity at all in respect of expert witnesses and to identify the dividing line between pre-trial and trial work as the limit to the scope of that immunity.
20. It is of course the case that the result in Saif Ali no longer represents the state of the law in the light of Arthur Hall v Simons . It is relevant to note that Lord Hoffmann addressed the very same observation of Lord Diplock in Saif Ali on which Chadwick LJ had relied in identifying the sole public policy reason for the immunity. He said at 698A:
"It is not sufficient, therefore, to explain any immunity relating to core proceedings by saying that the people involved to be free from "avoidable stress and tensions". That merely suggests that everybody would find litigation more agreeable if no awkward consequences could follow from anything which the participants did. It is another version of a vexation argument which I have already rejected. It is necessary to go further and explain why the public interest requires that a particular participant should be free from the stress created by the possibility that he might be sued. How would he otherwise behave differently in a way which was contrary to the public interest?"
21.
That observation was made in a part of his judgment headed 'The Witness Analogy'. Stanton had been cited in favour of retention of the advocate's immunity to which Lord Hoffmann responded:
"...but that seems to me to fall succinctly within the traditional witness immunity. The alleged cause of action was a statement of the evidence which the witness proposed to give to the court. A witness owes no duty of care to anyone in respect of the evidence he gives to the court. His only duty is to tell the truth. There seems to be no analogy with the position of a lawyer who owes a duty of care to his client. Nor is there, in my opinion, any analogy with the position of the judge. The judge owes no duty of care to either of the parties. He has only a public duty to administer justice in accordance with his oath. The fact that the advocate is the only person involved in the trial process who is liable to be sued for negligence is because he is the only person who has undertaken a duty of care to his client."
Lord Hoffmann for the majority was there comparing the expert witness and the advocate in order to distinguish their positions. Lord Hobhouse in the minority made the same comparison in order to demonstrate that like considerations applied to both (page 740H – 741D). Mr Ter Haar QC for hos part observes that it is ironic in the light of the disappearance of advocates' immunity, that the advocate was once considered the paradigm case for immunity, by comparison with the position of judge, let alone the witness (see Munster v Lamb(1883) QB 588 at 603 – 604).
22.
The Court of Appeal in Stanton v Callaghan identified the particular public policy as facilitating full and frank discussion between experts before trial as requiring that each should be free to make proper concessions, without fear that any departure from advice previously given to the party who has retained him, will be seen as evidence of negligence.
"The immunity is needed in order to avoid the tension between a desire to assist the court and fear of the consequences of a departure from advice."
Per Chadwick LJ at 101H – 102A (see also Lord Justice Otton at 108G-H.
23.
Lord Justice Nourse concurring saw no justification for distinguishing an expert and a lay witness either on the ground that the expert is usually remunerated for his services or that he would be less likely to be deterred from giving evidence.
"An immunity founded on the requirement of public policy that witnesses should not be inhibited from giving frank and fearless evidence cannot afford to make distinctions such as these. If they were allowed, it could never be certain that the public policy would not sometimes be put at risk." (109C)