And so, this is the big one. I trawl the whole of cardom to bring you seven great cars and truffle the undergrowth looking for seven automotive disasters. The good ones – the Ferraris, the Porches and the Aston Martins are driven to within an inch of their lives on the track. Some are even handed over to the Stig who makes a guest appearance. The bad ones are killed. Sawn in half. Hung, drawn…