[jonbxx]

The ECJ can only rule over areas where EU directives and regulations are in force so, if we want to have access to EU (and some non-EU) agencies, there is a case for 'sucking it up' and taking ECJ jurisdiction to get access.

My wish list would include;

EASA - aviation regulation including safety and the European Common Aviation Area
ECHA - chemical regulation and safety including REACH (huge impact to my business right now!)
EMA - European Medicines Agency
EUIPO - intellectual property
EFSA - food safety
EMSA - maritime safety
ECDC - disease control and epidemiology

Leaving these agencies due to ECJ jurisdiction in a quest for sovereignty seems to be the aim. It's each persons own value judgement to what cost is worth the degree of sovereignty we will gain.