Buckfast the other way.
This is one of the things that seems to have been brushed under the carpet by Salmond.
I used to coordinate international band tours before free trade in the EU came to pass.
It was a pain in the ass. You need specific paperwork in the form of a registered carnet, which is a list of all your equipment and where it was made.
It's a guarantee for the country you are entering that you won't sell your tack, avoiding import tax.
The paperwork costs money and requires a bond.
If I was an upcoming indie band I'd probably be inclined to give Scotland a miss, if this came to pass.