Overview: William Woollard at the British International Motor Show which opens on Saturday. Chris Goffey road tests the estate version of Peugeot’s successful 405; and reports on Malaysia’s emergence as a car-building nation with the Proton. Tom Boswell sheds some light on lead-free petrol. Beki Adam looks at the late Sir Alec Issigonis’ ‘poached egg’, the Morris Minor, 40 years old this year.