I don’t mind using something new, but if worse comes to the worst can I default back to MonoDevelop?
All the best,
It used to support Unityscript, since 1.9 version of Unity Visual Studio tools, that support is removed.
You can default it back to MonoDevelop under the Edit>Preferences>External Tools in the Unity Editor if you want that. This is just a theory, but it might be that only Unity 5.2 Pro has the visual basic support pre-built inn.