Per Lord Nicholls of Birkenhead in Re H (minors),  AC 563 at para 88:
88. At trials, however, the court normally has to resolve disputed issues of relevant fact before it can reach its conclusion on the issue it has to decide. This is a commonplace exercise, carried out daily by courts and tribunals throughout the country. This exercise applies as much where the issue is whether an event may happen in the future as where the issue is whether an event did or did not happen in the past. To decide whether a car was being driven negligently, the court will have to decide what was happening immediately before the accident and how the car was being driven and why. Its findings on these facts form the essential basis for its conclusion on the issue of whether the car was being driven with reasonable care. Likewise, if the issue before the court concerns the possibility of something happening in the future, such as whether the name or get-up under which goods are being sold is likely to deceive future buyers. To decide that issue the court must identify and, when disputed, decide the relevant facts about the way the goods are being sold and to whom and in what circumstances. Then, but only then. can the court reach a conclusion on the crucial issue. A decision by a court on the likelihood of a future happening must be founded on a basis of present facts and the inferences fairly to be drawn therefrom.