Thanks, I started a chat with GivEnergy Support today and they upgraded my inverter firmware to 210 while I waited. The battery firmware had been updated to 3020 a couple of days earlier, via the normal route i.e. the prompt on the portal’s inverter page. They couldn’t shed any light on why the inverter firmware hadn’t been flagged for update that way, though.
I did have a look at the manual update process but it didn’t really appeal: I’ve spent far too long squatted in the attic next to the inverter getting the wifi dongle set up properly to want to spend much time scrabbling around up there again! Especially so since the process seems to involve removing the dongle - I prefer to work on the basis that if it ain’t broke, don’t fix it!