Rcd trip? - Electrical job in Runcorn, Cheshire

Job description

I am looking for a guide price and adivce regarding the trip of a RCD switch in the mains box. Following guidance, process of ellimination has lead to the Hob unit causing this problem. Not sure what to do next!

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Would definetley recommend Ron and his services to anyone! Extrememly professional, Very reasonable price but more importantly a fantastic attentive service to match!
Ron gave some much advice and answered all my questions regarding the intrigue of our electric fault! And as a bonus he offered to fit our new hob when we had replaced the new one!
Such a lovely, hard working down to earth chap, you won't be dissapointed :)
Thanks Ron :)