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 Where does TrueLayer come in? How does Open Banking provide more choice for consumers? Do you offer trial periods? Comments 0 comments Article is closed for comments.