Seems to be a common setup on new cars.
It constantly scans the FM stations available and lists them by their RDS identities. Around London this is quite a long list.
One annoying feature is that the station at the top of the list is highlighted, not what you are listening to.
On a long journey the list usually updates, but sometimes not, and the list ends up empty.
Eventually it all wakes up again.
Roll on DAB, as the station list should not change so much.
Bluetooth and the phone setup are other stories!