Thanks Roch, I’ll give this a look. In the process of sorting out all of the plugins as I am moving the site off Sportix (way to many additional plugins with that).
I tell a lie, I’ve just been and re-connected Jetpack, and it looks like it is that, or one of the widgets within it that is causing my error above.
For the record, I have fixed this by turning all my plugins off and bulk turning them back on again.