Ten years ago none of us had even heard of Tesla, but with their Model S you cannot help but wonder whether the bigwigs at other luxury car makers have been caught with their feet up munching on the biscuits in the staff canteen. This is because Tesla for all their youth (incorporated in 2003) have effectively rewritten the rule book on luxury saloons, producing the first electric car which offers a usable real-world range (at least 250 miles), fast…