I spent quite a bit of time working, but I've managed to build a USB charging cable for the camera (of all the stupid... it needs a 10 ohm resistor between the data pins or it won't charge). I looked at the keyless ignition system on the DRZ, and I've decided to leave it unplugged for a day or so, as I seem to remember needing something like that to reset everything properly.
I went to the airfield in the evening, and fixed the airspeed indicator. I then went out for a flight, and was running down the river doing around 70mph ground speed when I suddenly realised I'd have to get home before it gets dark. Rather than play around anywhere else, I headed straight back to the airfield. I played around to see how low I could get the ground speed - 28mph - and landed shortly before sunset. At least I managed to put the plane away before it got dark.