Yep Ella....know that one!!
Mrrzy....my cousin drives a taxi in Belfast and he has a cassette player in the dashboard and his cd player in the boot/trunk.
He has one of those fold down arm rest things in the middle of the back seat so you can access the cd player from inside the car. Don't know about all the electrical bits but I know when I borrow his car I only have to press one button to change the controls from tape to cd and back again on the dashboard.

best wishes, Yvonne