JLWM1202 Program selector knob replacment

Hi,
The program selector knob is on its way out on my John Lewis washing machine (JLWM1202). The knob will currently only select washing machine programs if I turn it anticlockwise. The knob just turns round freely in the clockwise direction (no clicking noises) and does not select any programs, there is also a rattle which sounds like a part has broken when the knob is turned clockwise.

I have inquired about spare parts and wondered if anyone could give me some advice. I believe there are three parts to this program selector. The knob itself, a support, and then electronics behind. I’m assuming its either the knob or the support housing which has failed. Does this sound correct?

Is this a typical problem with this selector switch?
Does anyone have any instructions on how to replace it?
Do I need any special tools?

Thanks in advance for any advice.

Cheers
Tim