OIELH (see link below) has article on Restitution in English common law by Steve Hedley
Finding more commentary
To be thorough, use both the terms below in subject searches in SOLO - adding a jurisdiction name if that makes sense for your own research interest!
Unjust enrichment + name of jurisdiction
Restitution + name of jurisdiction
This journal is NOT (as of 2019) available online.
Our print copies are shelved at General 300 R45. Issues from & including 2000 are on Level 1; earlier years are on Level 0.