“The material facts about the damage are such facts about the damage as would lead a reasonable person who had suffered such damage to consider it sufficiently serious to justify his instituting proceedings for damages against a defendant who did not dispute liability [that, obviously, is not the position here] and was able to satisfy a judgment.”
“The damage was attributable in whole or in part to the act or omission which is alleged to constitute negligence, and the identity of the defendant.”
“A person’s knowledge includes knowledge which he might reasonably have been expected to acquire from facts observable or ascertainable by him, or from facts ascertainable by him with the help of appropriate expert advice which it is reasonable for him to seek.”