"[These requests] represent illegitimate attempts to rely upon experiments conducted for the purposes of litigation without the permission of the Court, and are not suitable for requests for a Notice to Admit Facts. The Claimants do not have permission of the Court to serve notices of experiments."
"That rule and the directions made in this action pursuant to it are intended to serve a purpose. Experience teaches that experiments are an expensive, time-consuming and frequently ineffective way of proving a technical issue. Furthermore, unless a party is given adequate warning of them and a proper opportunity to witness their repetition, they can result in litigation by ambush. Where a party intends to rely on experiments he must serve a notice as required by Ord. 104 r.12. The rule is mandatory not permissive. Such experiments will not be admissible in the absence of a notice unless, in the light of special circumstances, the court exercises its discretion to allow them in. If a party wants to have them admitted, in the absence of agreement from his opponent, he should normally make a formal application to the court to that effect. What he should not do is introduce them by way of the witness or expert statements or in counsel's skeleton arguments. That course is unfair to the other side. The latter may only realise at the trial what is being put forward and may thereby be deprived, in the absence of an adjournment of the trial, of the option of carrying out experiments in reply or of finding an expert who can answer the points to be made. Furthermore he will be deprived of the opportunity to have his experts witness the experiments."