Does anyone recognize this pipe?

Firstly can I introduce myself as I'm new to the site and also thank you all for the various threads on here that have helped me immensely. Whilst changing my discs/pads the other day I noticed that there was a pipe that was damaged under the rear passenger side wheel arch? I'm guessing that it was some sort of air pipe that has been corroded over time leaving holes in the pipe with just the metal outer pipe wall holding it together. It is clearly damaged and needs replacing. Can anyone tell me what it is, where I can get a new one and also a rough cost? Thank you in advance for any help. I have a photo but struggling to upload for some reason?!?:confused:

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