Legal advice needed,mortgage fraud,exagerated income?

Been charged with exagerating my income(mortgage fraud) just found out off the mortgage broker that the original application has been destroyed(hence no original signature)its a self cert mortgage and the broker is on side indictating projected income was put on application.My thoughts are that the original signature was needed ,not copy, and that the solicitor just wants to take this to crown court to obtain the fees,comments invited thankyou.