Hope it is okay to ask about primary admissions here?
No problem at all.
With KS1 classes, it's critical to know what the class size is, because Infant Class Size legislation may severely limit the grounds on which an appeal can be made.
For starters we need to know what the admission number is.
The continuing interest list is a completely separate process, and it's well worth providing the evidence that would put them higher up in the admissions criteria, in case any vacancies become available. I wouldn't have thought they'd need the original form to do this - a letter explaining that a mistake was made, and evidence of length of church attendance, probably ought to suffice.