It seems there is a very broad base of opinion on what should be done.
Speaking as an ex-controller (UK-based), it was precisely because there is such a broad range of views and opinions on this topic that I would always give specific instructions to an aircraft going around off a visual approach. If a go-around was going to be a real and immediate problem I would do as Monkey describes, "In the event of a go-around do xxx". Even if it wasn't going to present an immediate problem, as soon as an aircraft doing a visual went around I would give specific instructions.