Mk1 or mk2? They changed on the 'P'.

If its a mk2, just take the headlight out. 2 screws which hold the grille on, take the grille off, 1 or 2 (cant remember ) screws behind the grille, 1 screw by the wing at the top of the headlight and one down by the washer bottle. undo those and disconnect the multiplug and pull out the headlight and change the bulb.

If it's a mk1, the indicator lens should be held in with a clip.