Hah... got it. Silly me, I was assuming that the small hole on the side of the sprocket you can see, matched the position of the hole on the side you can't. They are of course 180 degrees apart.
Slightly concerning, the paint marks I put on the sprocket and the upper chain are now several links apart. Guess my screwdriver levering shifted the chain a bit... hopefully putting the same distance between the marks for the camshaft sprockets will be right, that is for tomorrow though. Will let you know if it starts 