[ZedForLife]

Where do you find the "Hidden Menu" that allows you to change the FM Radio parameters such as frequency range and enabling the AF function.
There is a general "hidden menu", which sets some parameters, such as for the GPS, etc., but does not set any FM radio parameters. RDS can be turned on and off in a regular menu.

Further to the above, I now conclude that for some reason BMW have deleted both the AF and the PTY functions from the idrive version of the radio.