Encouraged by success with the cross arm roll I thought I'd try the elbow roll. I can brace easily in the elbow roll position but can't get back on the deck. So when I tried it 'on the move' I was hopeful of a bit of help from the momentum of the body movement. I managed a few, maybe one out of every ten, only on one side, but its a start. It looks better on the video than it felt!