By the way, Is BAF similar to BAB? Sensei K is with the BAB and if I remember correctly, used t be invited to teach in their cross affiliation seminars way back when.
There's a test that he does he didn't show in the vid. I've always been impressed with it. He'll stand on his rear leg and have someone push his outstretched leading hand. You can't push him over. It's a basic ki test, one that tohei has a picture of. I'm pretty sure I pushed him quite hard before and cpuldn't budge him. Yet, that isn't the point of the exercise either. It's more of a way to build up nage's centering ability,
As for the ukemi I can't say it's bad or good. But the point was to walk straight at the end of the round. This is make sure you move from the center not the eyes,
The BAB is the body all aikido organisations in the UK belong to, I believe: it provides insurance, regardless of style.
The BAF is the main aikikai affiliate, I believe.
I believe I have seen his ki test videos.