I spent today going through the gap in my journals, and ten once the tax office opened, spent an hour or so on the phone to them to establish my options.
Happily, I AM allowed to do my return online, since I'm already set up for it anyway, there's just one document that I need to send in to support it, and since I can do it online, that also means I don't need an accountant, or special software, and also that my deadline is end of January, not the end of August! Result!