The UK’s Financial Conduct Authority has issued a short guide on how market participants can notify them that they intend to make use of the Ancillary Activity exemption as specified in MiFID II Article 2(1)j. The document can be found here.
Before establishing whether an exemption can be notified, market participants must pass the Ancillary Activity test, as outlined in RTS 20 (see here). Those under the jurisdiction of other National Competent Authorities will need to use a different notification mechanism.