This question is specifically about the law in England and Wales.
X and Y are joint tenants. Y severs the beneficial joint tenancy to become a tenancy-in-common (with a written notice). Y dies leaving his share to Z in a Will. In between Y's death and the distribution of the Will, X sells the property to Q and makes no mention of Z having an equitable interest in the property. What are Z's rights in the property? Does Z have an overriding interest?
Note: the change from the joint tenancy to tenancy-in-common was not registered.