i wish i had taken one. But what i can add is i disconnected the oven from the consumer unit and ran a spare cable direct from the the oven to the consumer unit and still had the same problem.
The unit was wired by the grid people. I'm an auto electrician so i had a look at it the only thing that was wired was the ring circuit which worked fine but when the oven was switched on it all tripped. So i disconnected the ring in both positive negative and earth and still had the same problem
My dad has a problem with a consumer unit at a house he bought. The only item connected to the consumer unit is an Electric oven. There is no lighting or ring circuits connected to the unit. Only positive, negative and earth from the meter and grid. But when anything on the oven is switched on...