I agree totally with Andrew, getting ones knee down, per se, is not an offence and as he goes onto explain, there are generally more offences being committed apart from rubbing knee sliders.
During the BikeSafe day we said that we
all enjoy motorcycling and being on the w/shop, most of, not all wanted to become a safer rider.
We talked about the system, observation, positioning, speed and defensive riding and the over arching mantra was being able to stop in the distance we can see to be clear on our own