The Notice of Intention to Marry (NOIM) must be completed one calendar month before your    wedding day.  It can be done up to 18 months in advance.  (Link to pdf file for NOIM)

You will need to bring an original birth certificate to our meeting. If you have been married    before you will need a Decree Nisi or your most recent divorce papers. Death Certificate if you  are widowed. You need two witnesses over the age of 18 for witnessing your marriage.