Anyway, bit of an update: Yup, still lame.
Though some sort of voluntary movement is returning to my arm. Still piss-weak and mostly flailing around uncoordinated, but it's there. I can very nearly hold my lower arm level for a second, which should be so trivial you'd never think of it as an achievement, but right now effort wise it feels like I'm putting a 737 worth of "what do you mean weight restrictions?" carry-on bags in the overhead bins... Some way left to go, then.
Having faint hopes that recovery might actually be closer to the 3 months best case scenario mentioned by the neurologist, instead of the year-and-a-half worse case recovery time... (Nevermind the fear of the "It's dead, Jim" permanent option that keeps lurking at the edge of my mind.)
Meanwhile, I get to keep busy with lots and lots of hospital visits, using public transport, and in between poking insurance companies with a stick. Things started off really well with them mis-filing my initial report with all the contact details for the people I'd crashed into. I hope that was their "insurance company" moment but won't hold my breath.
Note: The tramadol still seems to do nearly squat, both on the stopping pain front and the dancing hippos happy pills front.