Being perverse I did the floor first because it was dusty. I then
put newspaper on the floor near the walls and painted the walls.
There was still the odd drip,which wipes up with a wet cloth anyway.

I did mine the right way round. Then, when I'd finished, I smacked my roller
on a pole (loaded with taupe floor paint) into the lovely white ceiling. The
splat is still there!

Christian.