On 11 February 2022, the OGA published revised Cessation of Production (COP) Guidance.  

In late Field life, the Field Operator and Licensees are expected to confirm with the OGA whether the OGA will have any objection to the Field ceasing production, permanently, at a specified time. Consequently, in order to obtain such confirmation prior to ceasing production permanently from a Field or part of a Field,Licensees will have to satisfy the OGA that all economic development opportunities for hydrocarbon extraction have been pursued, both for the Field and for any associated current or future developments and that any infrastructure access considerations have been addressed.

This guidance has now been withdrawn - further details can be found here.