Are you talking about the CCC or the CIC system here? I'm assuming the former as the CIC has always had 7 digit postcode.
The CIC system is great - try the latest version. Admittedly the CCC version was a bit pants.
Current: 2013 F10 520d M-Sport, Professional Media, Visibility Pack, Reversing Camera, DAB
Previous: 2011 F10 520d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2