Practice Note: Unjust enrichment—elements of the claim explains the elements required for a claimant to found a claim in restitution for unjust enrichment and lists the defences that may be available to a restitutionary claim for unjust enrichment. Unjust enrichment is a unified legal concept and discrete source of rights and obligations, centered around a single set of common principles, whereby the law recognises, in a variety of distinct categories of cases, an obligation on the part of the defendant (D) to make fair and just restitution for a benefit derived at the expense of the claimant (C). More particularly, C must show three things to make out a claim in unjust enrichment: • that D was enriched • that D’s enrichment was gained at C’s expense, and • that D’s enrichment at C’s expense unjust Subject to that, the further questions arise, namely: • whether there are any defences to the claim or some other overriding legal principles, grounds or rights which may justify