Have you tried careful levering with a plastic spatula or similar? If there isn't any trim behind the lamp unit for access that must be the way it fixes?
John
Does the trim cover the electrical connection?
Maybe a good squirt of silicone spray around the clip area may prevent damage as you lever away......I have replaced a C1 lamp but not the later Aygo.
John
Thanks, managed to get the old one out, it was knackered anyway. The new one will just push in against the pressure of the spring clips. I have had a good look and now waiting for the replacement to arrive.