I am applying for OCI via Post and have the following documents ready.. Could few of you please confirm if they are correct? I know there could be few threads here already on this; unfortunately i couldnt find one

1. Completed Online application form- Part A & B with Photo affixed
2. Additional Photo with online reference no: quoted behind the photo
3. Postal Order of 175.00/- with online reference no: quoted behind the Postal Order
4.Self attested Photocopy of British Passport
5.Self attested Photocopy of Indian cancelled passport
6. Surrender certificate - Original and Photocopy(Self attested)
7. Naturalization ceritifcate - Original & Photocopy(Self Attested)
8. Prepaid Special Delivery Envelope
Also;is the prepaid envelope enclosed here only for the Original document (viz Surrender certificate & Naturalisation ceritificate)?
When do i need to send the Original British Passport for stamping?
Thanks
Girish