EU big, EU right
excepting the kippers who need 'special' consideration
We voted to leave the EU, not ESA. That means the electorate is opposed to closer political & economic union, but not against research collaboration. The EU is still on track to become a superstate, it's way more than just the free trade area we voted to join originally.
Our membership of ESA predates the EU's, but it appears the EU now decides who qualifies to participate, but Brexit must be seen to take the rap for the change in participation requirements (it's better PR for globalisation that way).
It's probably a good thing to define the future relationship now, since in the long term the EU superstate is likely to foment control of more European institutions. Every institution will have to decide it's raison d'etre. Should they serve the people or the powerful, and what's the contention?