It should not be IMM5669-the background declaration form. SGVO asks for both IMM5669 and Appendix A.As far I know it is not available in the website and it should contain the barcode sticker.
I cannot attach the image here, otherwise I can show the scanned copy of Appendix A.
This appendix A is a table requiring some of your information you need to tell them along with submitting the passports like- given name, family name, eye color, height, date of birth, place of birth, PP no Citizenship etc.
And another point of the form is - how you are going to send the PP- in person/courier/VFS