Materiality of conflict of interest in informed consent to medical treatment in the United Kingdom

The UK Supreme Court ruling of Montgomery v Lanarkshire clarified that in obtaining informed consent to treatment, practitioners are under a duty to inform patients of material risks. Traditionally such risk has pertained to the clinical risks inherent to treatment. In examining empirical and judicial evidence, this paper makes the case for disclosure of potent financial interests; with potency relating to those interests likely to have greatest influence over practice. The paper explores how financial interests may detrimentally influence practice patterns and how non-disclosure of such interests may be linked to the erosion of patient trust and subsequent disinclination to consent to treatment. Judicial notions of material risk are explored, and the conclusion reached that they offer a broader interpretation of disclosable risk compared to current UK GMC guidance. It is anticipated that empirical evidence could be used by the courts in determining questions of both materiality and causation in cases of negligent non-disclosure of potent financial interests. The paper concludes that there is sufficient reason to surmise that a test case could successfully apply the principles identified therein to establish the materiality of conflict of interest in informed consent to medical treatment.