Thanks for the reply Matthew , but mine doesn't have those buttons. Had to go to the garage for a look so maybe it's a different model than yours.
The volume knob is marked "RCL- Volume" when I push it in the clock is displayed, but nothing changes when I rotate it, or the tuning knob while its pressed. The unit is also a CD player. Heres an out of focus picture.
It's still got me puzzled
Willis