They are illegal, except the ones for disability, they are very different to the ones could buy in retail car shops and its illegal for me to drive without one, but illegal for others to drive with them. I've been using a spinner knob for over a decade now, as my right hand doesn't function to steer but the specific hand control I have, works with the not functioning right hand. I had to have a couple of lessons with spinner knob back in the day and it put on my licence.
So in a nutshell only those with medical exemptions can use them.

I've just had a spinner knob upgrade with the new one! Has buttons to work indicators, high beam, horn and window wipers
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