"i) There is no need for Art 13(b) to be narrowly construed. By its very terms it is of restricted application. The words of Art 13 are quite plain and need no further elaboration or gloss. ii) The burden lies on the person (or institution or other body) opposing return. It is for them to produce evidence to substantiate one of the exceptions. The standard of proof is the ordinary balance of probabilities but in evaluating the evidence the court will be mindful of the limitations involved in the summary nature of the Convention process. iii) The risk to the child must be 'grave'. It is not enough for the risk to be 'real'. It must have reached such a level of seriousness that it can be characterised as 'grave'. Although 'grave' characterises the risk rather than the harm, there is in ordinary language a link between the two. iv) The words 'physical or psychological harm' are not qualified but do gain colour from the alternative 'or otherwise' placed 'in an intolerable situation'. 'Intolerable' is a strong word, but when applied to a child must mean 'a situation which this particular child in these particular circumstances should not be expected to tolerate'. v) Art 13(b) looks to the future: the situation as it would be if the child were returned forthwith to his or her home country. The situation which the child will face on return depends crucially on the protective measures which can be put in place to ensure that the child will not be called upon to face an intolerable situation when he or she gets home. Where the risk is serious enough the court will be concerned not only with the child's immediate future because the need for protection may persist. ….. In Re E, the Supreme Court made clear that in examining whether the exception in Art 13(b) has been made out, the court is required to evaluate the evidence against the civil standard of proof, namely the ordinary balance of probabilities whilst being mindful of the limitations involved in the summary nature of the Convention process. Within the context of this tension between the need to evaluate the evidence against the civil standard of proof and the summary nature of the proceedings, the Supreme Court further made clear that the approach to be adopted in respect of the harm defence is not one that demands the court engage in a fact-finding exercise to determine the veracity of the matters alleged as grounding the defence under Art 13(b). Rather, the court should assume the risk of harm at its highest and then, if that risk meets the test in Art 13(b), go on to consider whether protective measures sufficient to mitigate harm can be identified."