Thanx for the response El..........you are correct. l wasn't having much luck looking around the net for the radio tuner so plugged in a search for the tv tuner....figured (or hoped..!) that they would be situated close to each other.....they were.!!!!!!

To access, take out the spare tyre, then it's necessary to remove a couple of support brackets which are supporting the ABS module (black dome looking thing which the spare sits on top of).

The tv and radio tuners are now visible, situated just in front of the battery. All I gotta do now is install the Dension.........again, thanx for help.