Laura Langley, 38, was alleged to have killed her seven-week-old daughter Edith who collapsed at the family home in Blackpool, Lancashire, in the early hours of 20 November 2020. The Judge found that the expert evidence in the case of Professor G, of Professor N and of Professor D each at times fell below the high standard expected of expert witnesses giving evidence before the family court in this jurisdiction. This judgment illustrates a number of important lessons for expert witnesses. The criticisms go well beyond a disagreement between experts—they concern the duties of an expert to the court. An expert who appears to defend a predetermined hypothesis rather than follow the evidence risks losing credibility entirely, regardless of their qualifications or experience. This judgment illustrates that methodological rigour, transparency, and impartiality are essential to persuasive expert testimony.

The RICS has recently published the 5th edition of its Surveyors acting as expert witnesses professional standard (‘standard’). We participated in the RICS consultation on the draft standard, and we are pleased to note that most of the issues we raised have been addressed in the final published standard and practice guidance. However, we continue to have concerns that the standard and the practice guidance may have the potential to mislead experts into not fully complying with the applicable rules and regulations.