If it's OEM then yes without question. If you've added it and it's listed on the policy, then yes. If it's not declared, youre out of luck.
I just read back my first post, I hope I didnt come across too hard hearted - it is bl00dy awful, but I made a conscious effort not to let it get too me. I can afford a nice car, they can't. The car can be put right. They will always be low-life scum and will get their comeuppance sooner or later. Fortunately, is doesnt happen that often.
All the best sorting it. And make sure you push to use a VW body shop. That way, all the corrosion warranty to properly covered and they know the car a lot better than your average pikey insurance bodyshop. The guy that did the insurance quote for my insurance co. was a complete cowboy. Who ever attacked my car obviously gave it a good kicking too. Glass was hanging out the wing mirror, chrome plinth was dented and cracked. Insurance body shop talked about gluing the glass back in and I'm sure he was looking for a way to bodge the chrome grill too. VW picked up every little imperfection without any prompting. They even replaced the front wing because the kick had buckled it - the other guy didnt even notice.
Quote was double from VW but you pay the same excess regardless of where it goes, so insist on VW. There is extra leg work in it for you, as you need to submit the VW quote your self, but worth it in my mind.