I was always a (happy) member whilst still in the UK, but when I moved to Germany I was not allowed to remain a member of the Society in Scotland.
There is an affiliated society / branch, based in Holland, which covers the rest of the EU.
To be honest, their service was lousy, the monthly magazines never arrived - which meant I had no information about the bottlings and no chance to buy.
After some time and many complaints I finally decided to leave the Society.
If you are allowed to remain a member and recieve offers from the original Scottish Society, then I would say go ahead, the bottlings are really worthwhile.
If they try to make you join the EU version, based in Holland, then good luck.