It was version 2.0.19 and the latest version is 2.0.22. I should really keep up to date right? Well not that simple. They changed the way phpbb is installed so I had to install a new one. I selected the existing database but it wiped it. They had to restore it but it looks like we didn't lose anything. Or at least not much.
And after all that, its right back to 2.0.19.
So there may be more fiddling with the forum in the coming days.