Clear as mud: Proprietary Estoppel after Guest v Guest

The dust should now have settled since the Supreme Court’s landmark decision in Guest v Guest (2022). However, in exploring recent case law, this article exposes that the rules applied to decide proprietary estoppel cases remain as uncertain as ever. Some commonality can be identified, but only in the persistent favouring of promisors over promisees. This article criticises the practical and theoretical underpinnings of proprietary estoppel and proposes further reform. In particular, the article draws new links from the doctrine of secret trusts to suggest a more just and certain basis for proprietary estoppel’s future application