My girlfriends mk6 fiesta has developed a loud twanging like a spring uncoiling when turning from lock to lock.

I crawled underneath the best I could with a torch but it's too low (standard) to get underneath properly.

The only unusual (to me) thing I can see is what looks and feels like a rubber tube dangling down the inside of the drivers front spring and can't see or feel one on the passengers side. But I don't know if that's normal or not at all..?

It hasn't done this ever before and I used it today on a 50 mile round trip and it hadn't done it then and just now we went to go out in it and it started. It reverberates around the car it's a loud twang!