Guys,

TP is Traffic Program in the UK. when TP is enabled ie shown on the display on the radio whenever there is a traffic annnoucement on any radio stations you are within range of the radio automatically switches to that station, if the CD player is playing then is pauses it, when the announcement is finished the radio goes back to the original station/CD track and carries on playing. Some high end radio's record this information whilst you are out of you car so you can replay them just as you get back into it.
Its a fairly cool feature, but i always have it disabled as it always seems to activate at the best part of your favourite song. 8)