Sorry Knobby,
I wouldn't wish to contradict you, but the information I gave is quite correct if anyone would care to check. And a certified electrician has to provided the customer with a legal certificate. I'm not professing to be brainer than anyone else. Its just that I have recently bought a new cooker, and that's the information I was given, and checked with my household insurance company, who informed me that without the certificate, my household insurance would be invalid. I wouldn't like anyone to find themselves in the position of having no insurance when something happened. By the way, I am pretty calm.