Have the exact same problem.
Cooking my dinner the other night, when I heard a loud buzzing and the oven died. It blew the main 30Amp fuse in the fuse box.
Replaced that and tested. Everything appeared to be working until last night. Went to get the roast out the oven and discovered that it wasn't even warm.
Now looks like the element has blown.
Just ordered a new one from cannon. Just hope it's easy to replace.
Andy
February 2009