From the UK embassy website
CNI for same day processing (If your CNI was issued by your registrar in the UK or issued by other British Embassies abroad)
· Present the original CNI (3 months validity only from date of issue)
· Present your passports
· If widowed, present original death certificate of the deceased spouse
· If divorced/annulled, present the original divorce decree/annulment papers
· Original CENOMAR for Philippine citizen fiancee (3 months validity only from date of issue)
· If you want to make a correction on the name that was mis-spelled on the CNI that was issued abroad, present his/her passport/birth certificate
· Pay the CNI fee (please refer to the attached Consular fees)
I think I had a copy of the my wifes passport but the CENOMAR was the original.