Are you a 'proper petrolhead'? The gospel according to Clarkson says you are not if you haven't owned an Alfa Romeo. So this week the lads are each given £1,000 to buy an Alfa Romeo, which will then be put through a series of challenges. The Bentley Brooklands gets the Clarkson treatment on the track and James Corden and Rob Brydon are the Stars in a Reasonably Priced Car.