I believe the two CPL flying in a Multi-crew operation is currently a proposal in the U.K. and hasn’t been approved. A SkyWise will be issued with the requirements when it is.
The outline plan is that an Operator apply for an exemption to the ATPL requirement for MP operations and that application will be forwarded to EASA for approval. Passes in the ATPL(H) examinations will be required.
This is the latest information I have and may now be out of date.
FNW