Many thanks - no, I've seen this video during my hours of trawling the internet. I've removed the lights, a star bolt under each wheel arch, two metal screws under the pan, and loosened all the plastic clips along the tops of the wings. Removed the black plastic shroud inside the boot, and pulled back the rubber strip. Something is still holding at each end, and I cannot see what - it's so infuriating that any remaining fixing is so well hidden!