Audi A1 :A proper Audi in miniature. That's the idea of the Audi A1 which, its creator claims, is the first compact car in the premium sector. Is Audi seriously ignoring the Mini, the Alfa Mito, the socially mobile Citroën DS3? First off, a red one with silver roof hoops and a 122bhp, 1.4-litre, turbocharged engine. It looks neat, uncluttered, taut, confident, with a shorter front overhang than