I will try to make this short, if your going to appeal against the decision you first need to write a letter to your local crown courts asking for a hearing to appeal against the decision,you will then be contacted by you local firearms officer who will come & visit you to discuss your past & present situation, once he or SHE(equal rites ) has been they will put a report together for the courts, on this they will indicate that they intend to object or not object against your appeal.
You will then be given a court date for the hearing, the police will send you a copy of the report