Thanks Paul, actually I was just reading your earlier post where you said you can connect by setting the wired connection to 192.168.1.1.
I have a lowish-cost 'lightly-managed' switch on that address at the moment. I could probably move it if need be, but for now PAW is working well just by the cable connection. Also, it avoids the security risk you mentioned.
All I need to do is remember to plug the wifi back in before going flying
Off topic slightly, but is GDL90 also available over the wired connection? I searched for some documentation on that, but didn't find it yet.