Who implements Open Banking and who enforces it in the UK? Naomi June 18, 2019 08:14 Updated Follow A public entity called the Open Banking Implementation Entity has been tasked with implementing the CMA (Competition & Markets Authority) order. The CMA enforces it. More information can be found on the Open Banking Implementation Entity page and CMA. Related articles How does Open Banking provide more choice for consumers? Where does TrueLayer come in? Which UK banks and account types are supported? What are the minimum and maximum payment amounts possible? What is the difference between PSD2 and Open Banking? Comments 0 comments Article is closed for comments.