Even if iut worked like that with oubs (and ut won't), that still means on the face of it that it'd be illegal to play in any othewr public place which didn't have a licence. As it is now (or at least it's illegal to permit it to happen - a subtle but essentiually irrelevant distinction in mots circumstances).

And that's why we no longer have any knd of coffee bar/coffee house folk scene, which is largely where it started back in the 60s.