"13. ... The Tribunal felt that there was merit in Mr Davidson's argument about the practicalities of putting a camera in for a week only but they also were faced by the fact that the respondent's representative had not cross-examined Mr or Mrs Bull with regard to this conversation and while the failure to cross-examine does not mean that the evidence must be accepted as true the Tribunal is entitled to draw a deduction from the failure of a professional advocate to challenge evidence in chief. Failure to cross-examine a witness on some material part of his evidence may be treated as an admission of the truth of that part of his evidence. In this case the balance between the evidence of Mr and Mrs Bull and Mr Davidson appeared to the Tribunal to be very even but the Tribunal finds that the failure to cross-examine enables it reasonably to come to the conclusion on the balance of probability that the evidence of Mr and Mrs Bull is correct."