6. However the High Court has cautioned that, even when one of the four situations mentioned in Question 5 (above) arises, and even when the PEL of which the plaintiff complains was 'reasonably foreseeable', it will not always be appropriate to allow such claims. The Court has highlighted a number of other factors ('salient features') which, together with 'reasonable foreseeability', will have to be taken into account in determining the 'Duty of Care' issue in a PEL case. What are the most important of those 'salient features