I can't believe my luck.. more rust!
Went back to the body shop straight away, the claim won't be as fast paced this time. They explained that unlike the wings, they need it authorised before they can start work, so paint measurements were made and photos were taken which will all be sent off. They said the next step will be an attempt to repair, but once stripped down if it's really bad, they will then replace it.
Pretty annoying but confident it will get sorted