“Nevertheless, it is appropriate that the approach which this court has adopted since Humphreys[2012] 1 WLR 1545 should be modified in order to reflect the nuanced nature of the judgment which is required, following the jurisprudence of the European court. In the light of that jurisprudence as it currently stands, it remains the position that a low intensity of review is generally appropriate, other things being equal, in cases concerned with judgments of social and economic policy in the field of welfare benefits and pensions, so that the judgment of the executive or legislature will generally be respected unless it is manifestly without reasonable foundation. Nevertheless, the intensity of the court’s scrutiny can be influenced by a wide range of factors, depending on the circumstances of the particular case, as indeed it would be if the court were applying the domestic test of reasonableness rather than the Convention test of proportionality. In particular, very weighty reasons will usually have to be shown, and the intensity of review will usually be correspondingly high, if a divergence in treatment on a “suspect” ground is to be justified. Those grounds, as currently recognised, are discussed in paras 101—113 above; but, as I have explained, they may develop over time as the approach of the European court evolves. But other factors can sometimes lower the intensity of review even where a suspect ground is in issue, as cases such as Schalk, Eweida and Tomas illustrate, besides the cases concerned with “transitional measures”, such as Stec, Runkee and British Gurkha. Equally, even where there is no “suspect” ground, there may be factors which call for a stricter standard of review than might otherwise be necessary, such as the impact of a measure on the best interests of children”
“The fact that there are grounds for criticising, or disagreeing with, [the views of the Minister] does not mean that they must be rejected. Equally, the fact that the line may have been drawn imperfectly does not mean that the policy cannot be justified. Of course, there will come a point where the justification for a policy is so weak, or the line has been drawn in such an arbitrary position, that, even with the broad margin of appreciation accorded to the state, the court will conclude that the policy is unjustifiable. However, this is not such a case, in my judgment”