Error on Form AN - British naturalization (Parent DOB)

[egie1234]

How do i go about correcting an error on past application made on form AN regarding my mother's date of birth? The application was granted for naturalisation,Now I have applied for passport and just realised the error after the passport application submission. Instead of having 4th April, I wrote 5th April as mother's date of birth, also the year was wrong. Pasport Interview is in a week's time.
Do I call them, write to them or continue with the date of birth?

Note that I did not qualify for british citizenship through parent but through tier 1 general.

Please your advise is needed.

[CR001]

You can't change form AN application if already approved.

If they raise it at your interview, just mention you made an error.