From reading other threads created by people, I have sent a letter to the court with a copy of my charges and asked for it to be included with my case. I sent this when i got my Notice of Issue. When i receive my Notice of Acknowledgement from them i will then send a letter to Nationwide with a copy of my charges and again ask for it to be included with my case.
Just a waiting game now
EDIT:
Oh and i did include the extra 8% interest, BUT only when i got to the court stage.