Easy to understand guide to why Scotland is not an EU member.

You (Scotland ) Join a Gym (UK) the Gym has a special deal for its members were they also get membership of a local swimming pool (EU)

If you (Scotland)like the swimming pool but not the gym and you leave the gym (UK)you don't keep the membership of the swimming pool (EU)you have to then apply to be a member of the swimming pool (EU) separately.