Jenny must perform to the standard of an ordinary driver, as established in Blyth v Birmingham Waterworks and Nettleship v Weston
Likely breach as the activity was illegal and had no apparent utility justifying the risk, as seen in Paris v Stepney
Clear factual cause of the accident, as in Barnett v Chelsea & Kensington
Injury to a pedestrian like Carlos could be reasonably foreseeable, following the principle in Wagon Mound No.1
Possible contributory negligence as another person should have been holding the ladder secure
Possible partial defense reducing damages in proportion to fault, under s.1 Law Reform (Contributory Negligence) Act 1945, as in Sayers v Harlow
Nearness: she arrived within minutes, strengthening her claim, as in McLoughlin v O'Brien
Dearness: she is not a spouse, so the burden of proof would lie on her to show that the relationship between her and Carlos was one of close love and affection, following Alcock v CC South Yorks
Lisa against Jenny:
Jenny's severe psychological distress is likely to be recognized, based on McLoughlin v O'Brien
Jenny is a secondary victim as she did not reasonably fear danger and was not in the zone of danger, following Page v Smith
Psychiatric injury is arguably reasonably foreseeable following her discovery of Carlos in such a state, even to someone of reasonable fortitude
Cause of trauma was the accident, not subsequent negligent medical treatment, as established in Paul v Royal Wolverhampton
Hearness: she has witnessed the immediate aftermath with her own unaided senses
To establish a claim for psychiatric injury, the individual must be suffering from a recognised psychiatric condition
The first hurdle to overcome is to show that the individual is experiencing a positive psychiatric illness, not just grief or distress
Only recognisable psychiatric harm is considered for claims, and expert psychiatric evidence is needed to determine the line
The law restricts the number of potential claimants for psychiatric loss on a policy basis
Primary injured participants or those who reasonably feared injury from the incident can claim
Secondary witnesses who are harmed but not in danger of physical harm are subject to policy restrictions for claims
Criteria for policy reasons differentiate between primary and secondary victims, with a focus on the zone of danger
Rescuers can claim for psychiatric injury as primary victims if they were exposed to danger themselves, or as secondary victims if they were not in personal danger
Damage to personal property can lead to a claim for psychiatric loss if the Alcock criteria are met
The traumatising event does not need to be sudden and shocking for a claim to be made
The law limits claims to those who have witnessed the event or its immediate aftermath with their own unaided senses
The time between the accident and exposure to its traumatising effect is crucial for determining the success of a claim
The law presumes sufficient affection for meeting the criteria only exists between spouses or between a parent and child
Difficult distinctions are made when determining the level of closeness in relationships for claims
The law faces a dilemma regarding rescuers' claims, balancing the desire not to dissuade rescuers with fairness in allowing claims
Psychiatric injury must be based on psychiatric illness, not mere grief or distress
Claims can only be made for accidents, not reactions to subsequent medical treatment
Psychiatric injury must be reasonably foreseeable to a person of normal fortitude
Claims are limited to those who have witnessed the event or its immediate aftermath with their own unaided senses
The law establishes tests of hearness, nearness, and dearness to restrict claims
Rescuers can claim for nervous shock if they were personally in harm's way
Damage to personal property can lead to psychiatric loss if the Alcock criteria are met