Parkinson Cowan 60 GLXa Freestanding gas cooker?

The gas cooker lid sensor faulty, it does not allow the gas to flow to the burners etc. when in the upright position. You have to put the lid down and then up few times for it to function.

The larger cooker ring has stopped working on full gas even though it is on full from the cooker knob. All the other three burners are working as expected. Appreciate, if someone can help.Thanks in advance