Dude! You rock! Sorted.
I’ve noticed that on hover, the link doesn’t change background colour like all the other ones in Discourse. I’ve tried to hack some CSS to cover that, which works well enough:
.custom-header-links .headerLink a:hover {
background-color: #343434
}
It would be good to get this into the theme-component CSS, but I’m too much of a numpty to do that. Maybe time to get onto GitHub, eh?