Yep, got the LED headlights. I was about to enter the car lift at work when the error popped up and both the lights did look level, however, they were quite low.
Been having a look around online and I think I might have caused this by going over a massive bump last night on my way home as there's a sensor on the suspension apparently. Went back out before and the error didn't pop up. Tempted to ask them to have a look at it if it continues at the next service (Due in Jan/Feb), don't fancy a massive bill though haha