How can I mend my cannon cooker igniter?

Hello, I have a cannon gas cooker, on pressing the igniter switch it clicks once only, but even then only after a pause and pressing it again; before pressing the switch produced a continuous clicking until released, as you would expect.

My first through is switch is gone, because it's producing some kind of electrical response, even if only one click and the hob area terminals are all clean

Many thanks.