‘The assessment of credibility generally involves wider problems than mere “demeanour” which is mostly concerned with whether the witness appears to be telling the truth as he now believes it to be. With every day that passes the memory becomes fainter and the imagination becomes more active.’

‘Therefore, contemporary documents are always of the utmost importance’.

Lucas Direction and Re A-B-C updated guidance

It is common for witnesses in these cases to tell lies in the course of the investigation and the hearing. The court must be careful to bear in mind that a witness may lie for many reasons, such as shame, misplaced loyalty, panic, fear and distress, and the fact that a witness has lied about some matters does not mean that he or she has lied about everything (see R v Lucas  [1981] QB 720).

That a witness’s dishonesty may be irrelevant in determining an issue of fact is commonly acknowledged in judgments, and with respect to the Recorder as we see in her judgment at [40], in formulaic terms:

“That people lie for all sorts of reasons, including shame, humiliation, misplaced loyalty, panic, fear, distress, confusion and emotional pressure and the fact that somebody lies about one thing does not mean it actually did or did not happen and / or that they have lied about everything”.

But this formulation leaves open the question: how and when is a witness’s lack of credibility to be factored into the equation of determining an issue of fact? In my view, the answer is provided by the terms of the entire ‘Lucas’ direction as given, when necessary, in criminal trials.’

Crown Court Compendium legal summary

Chapter 16-3, paragraphs 1 and 2 of the December 2020 Crown Court Compendium, provides a useful legal summary:

“A defendant’s lie, whether made before the trial or in the course of evidence or both, may be probative of guilt. A lie is only capable of supporting other evidence against D if the jury are sure that: (1) it is shown, by other evidence in the case, to be a deliberate untruth; i.e. it did not arise from confusion or mistake; (2) it relates to a significant issue; (3) it was not told for a reason advanced by or on behalf of D, or for some other reason arising from the evidence, which does not point to D’s guilt.

The direction should be tailored to the circumstances of the case, but the jury must be directed that only if they are sure that these criteria are satisfied can D’s lie be used as some support for the prosecution case, but that the lie itself cannot prove guilt. …”

Guidance from Re H-C and Sir Andrew McFarlane

In Re H-C (Children) [2016] EWCA Civ 136 @ [99], McFarlane LJ, as he then was said: “ In the Family Court in an appropriate case a judge will not infrequently directly refer to the authority of Lucas in giving a judicial self-direction as to the approach to be taken to an apparent lie. Where the “lie” has a prominent or central relevance to the case such a self-direction is plainly sensible and good practice. 100 … In my view there should be no distinction between the approach taken by the criminal court on the issue of lies to that adopted in the family court. Judges should therefore take care to ensure that they do not rely upon a conclusion.

To be clear, and as I indicate above, a ‘Lucas direction’ will not be called for in every family case in which a party or intervenor is challenging the factual case alleged against them and, in my opinion, should not be included in the judgment as a tick box exercise. If the issue for the tribunal to decide is whether to believe A or B on the central issue/s, and the evidence is clearly one way then there will be no need to address credibility in general. However, if the tribunal looks to find support for their view, it must caution itself against treating what it finds to be an established propensity to dishonesty as determinative of guilt for the reasons the Recorder gave in [40]. Conversely, an established propensity to honesty will not always equate with the witness’s reliability of recall on a particular issue.

That a tribunal’s Lucas self-direction is formulaic, and incomplete is unlikely to determine an appeal, but the danger lies in its potential to distract from the proper application of its principles. In these circumstances, I venture to suggest that it would be good practice when the tribunal is invited to proceed on the basis , or itself determines, that such a direction is called for, to seek Counsel’s submissions to identify: (i) the deliberate lie(s) upon which they seek to rely; (ii) the significant issue to which it/they relate(s), and (iii) on what basis it can be determined that the only explanation for the lie(s) is guilt.

The principles of the direction will remain the same, but they must be tailored to the facts and circumstances of the witness before the court.’