So, after debating, rationalising and talking myself out of it, I finally went black again.
When I cut my hair into a bob, it was brown. I'd loved the brown when it was long with weave), but I didn't like it short. So I returned to my old classic of blue. I haven't been happy blue though, and I knew the only option would be black. I tried to stay blue for as long as possible, but I finally succumbed to the dark side.
It needs a cut/reshape, which I'll hopefully squeeze in today!