@ Mark,
After removing the 2 screws you refer to, kneel down and get the "X shaped moulding protruding through a retaining ring" within your line of sight. Look to the side of that X and you will see a cheeky wee screw sitting in a recess. It should be identical to the other 2 screws you have removed. Unscrew the lower screw. You might find it still sits in the recess once unscrewed. You can leave it and catch it when it falls out as you slide the headlight unit out or get a pair of tweezers and remove it before you slide out the actual headlight unit.
Now, place a thin cloth or towel onto the top surface of the bumper below the headlight unit so as not to scratch the bumper paint when sliding the light unit over the top of the bumper.
The light will slide over the "x moulding" if you slide your fingers between the edge of the light unit and the scalloped flexible plastic 'curtain', then grabbing the back of the headlight unit in line with the X and you will find that the light unit will glide over the X no trouble at all.
With a hand on each side of the headlight carefully slide the headlight unit forward an inch or so and you will then be able to unplug the light connector before easily sliding the entire unit out and place the unit face down on a towel to avoid scratching the lens.
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