This article critiques the ability of the ‘manifestly without reasonable foundation’ (MWRF) standard of proportionality review, applicable in cases involving questions of socioeconomic policy, to constitute an effective model of rights review. In particular, in attempting to reconcile effective rights protection with appropriate judicial deference on policy questions, MWRF is prone to polarisation into strong and weak forms of review. This is demonstrated with reference to MWRF cases decided by the UK Supreme Court. The jurisprudence comprises two ‘streams’: one showing deferential respect for executive/legislative decision making, the other showing a greater judicial willingness to protect and enforce rights and values. The question of whether a judge inclines to one or another stream often depends on the contextual factors to which they are willing to give decisional weight: more deferential judges tend to focus on structural reasons (e.g. socioeconomic context); whereas judges more protective of rights tend to focus more on individual impacts and wider legal norms. While such a pattern may predictable in a system of rights adjudication, the extremity of the force is not. The former, more deferential, approach has become increasing and significantly dominant over time, as those justices inclined to focus on contextual factors demanding deference have become more influential and numerous on the Court. However, it is suggested that the subordinate, more intensive stream, has not been entirely suppressed. The overall effect is to leave significant flaws in policymaking unscrutinised, while occasionally and unpredictably cutting across administrative discretion. While the recent case of R (SC) v Secretary of State for Work and Pensions can be rightly criticised for excessive deference and conservatism, this article claims that it is in fact part of a more general trend that can be seen in other cases over the last decade or so.