Will they have to take the boot lid trim off to do it?

If they can get to it, then that can be sorted. Its done from behind, so yes the trim will need to be removed.

Looking at it in the picture, that's a fairly easy one...

If it was done by that Corsa behind you I hope you gave it a jolly good kick back!!

If it was done by that Corsa behind you I hope you gave it a jolly good kick back!!

LOL, that's the wife's. It's a horrible, horrible creation. We had an incident a couple of years ago, slight break down in communication, both reversed at the same time (me in my old Octavia) and hit each other. Massive dent in the Corsa, not a mark on the Octavia. Hopefully the guy who did the repair on that will do mine.