Hi Brian, how old is your cooker?
Also when does it blow at the mains?
DO you need to turn something on?
Hello Brian, my name is George..If as you say, the consumer unit is tripping immediately that you switch the cooker on at the wall with nothing turned on then you have one of a couple of faults and need the services of an appliance engineer1. An earth fault on an element that requires replacement2. A short fro live or neutral to earth3. A faulty supply cable4. A fault in the terminal box of the applianceLet me know your postcode if you would like me to find you an appropriate engineerFeel free to ask further information about the reply I have given you, but kindly be patient whilst awaiting any responses from me as I'm not constantly available.