The middle one is the headlight adjuster motor.
Anyhow, been out and done it again.......
Looking into the right hand side dipped beam rear access hole after the rubber cap is removed. The outer most rubber cap of the three.
The trick is to stand by the wing at the back edge of the left side headlight and face your body forward. Then put your left hand (righthand dipped) into the hole and clasp the plastic "fin" between your 1st and 2nd fingers. Now twist anti-clockwise and it should fall out. Same for the left dipped beam, stand by the left wing at the back edge of the headlight, with your body facing forward and use your right hand. Again grip the plastic "fin" with 1st and 2nd fingers and twist.
The left side is slightly more difficult because the fusebox position nearby.
When refitting, offer up the bulb holder at 25 - 30 off-set anti-clockwise with the electrical contacts on the correct side and insert it into the back of the headlight unit until it is seated. Then twist clockwise until you hear/feel the electrical contacts click home.
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