Went to the other dealership on Saturday.....
At first he said they would need to book it in to look at it - I suggested (most politely) I'd rather he stepped outside to look at himself as I'm rather unhappy about it...
He said he'd never seen anything like it and all they would do is take off and put on and see if it did the trick and suggested I go to the dealers bodyshop as they are the experts in all things body panel related.
So I'm off there this week.