I'll answer my own question.....
Under each dash speaker in the front is a screw holding the dash. Remove these 2 and then the dash lifts off (use a flat head screwdriver to pop th dash up). Unscrew the display and there is a yellow screw-in wth a bulb attached to the rear. The bulb is available in Maplins (UK). I replaced th bulb and could now see what was happening. I then re-enaled the main buttons on the head (seeing the display helped)!!!!
Ross McCarthy, February 2005