Adopt the approach a friend of mine uses, which is to just walk in carrying a folded brompton as if it's the most normal thing in the world whilst looking fairly fierce. If anyone objects, ask to check it in to the cloakroom. Most restaurant staff don't want the aggro of an aggrieved customer. (I think it helps that my friend is 6'3 and has a shaved head).
Adopt the approach a friend of mine uses, which is to just walk in carrying a folded brompton as if it's the most normal thing in the world whilst looking fairly fierce. If anyone objects, ask to check it in to the cloakroom. Most restaurant staff don't want the aggro of an aggrieved customer. (I think it helps that my friend is 6'3 and has a shaved head).