There was sleet and some ice from the snow on the incline, so I was worried about losing traction, attempted to slow control the bike round the corner, lost too much speed and tipped to the left. The camber meant that by the time my foot hit the ground the bike was already past its tipping point, went over, and I rolled down the incline.
Now, covered in mud, I had to work out how to right my bike which had it's wheels off the ground due to the camber. Managed that in a two part lift, but my legs were so weak after that it took me several goes to get it off the kickstand to ride away (since the camber meant on the kickstand the bike was leaning quite far over).
Harris Neill shows how it should be done on a heavy bike: