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How to fix a broken knob for the fan assisted oven cannon 1000?

The knob has snapped right off and there are two screws that secure the plate which I assume this part also needs replacing. I need to know how to access it and what parts need to be ordered. It is the Cannon Range dual fuel cooker and it is the fan oven knob that has broken.
Many thanks
Nemetona, March 2013