These suggestions to the Clergy were issued in 1901 but I'm sure they applied before then.
Persons of Illegitimate Birth are sometimes unwilling or unable to state the Name and the Rank or Profession of their Fathers. If, on these Particulars being asked for, there be any hesitation or reluctance to state them, no further inquiry need be made, and Columns 7 and 8 may be left blank; lines in ink should be drawn through the blank spaces.
Stan