Actually, that's a very fine point; I have not done that thing. I will go into the shop-of-choice and do that very thing.

Do I need to be able to tell them who's publishing it, or which distributor is handling it? Or will "C E Murphy's Take A Chance" be enough? (I don't order comics as a rule, so I don't know how the process differs from books.)

(Of course, it's also possible-to-highly-likely that samarcand above has already done this, in at least one of the shops; I'll check that too, and if so I'll go to the other one...)