Got to maintain VMC though.
Not just that, but if you have a UK issued PPL you've also got to be "in sight of the surface". That might be a bit of a challenge if you're going to explore the other side of our solar system.
"Yes your honour, I know I've got to remain in sight of the surface. My trajectory was so that the sun blocked my vision of the earth for just a few seconds. But that's no problem since I was in sight of the surface of Mars during that period. And the ANO doesn't specify which planet I've got to keep in sight."