Passport application for 2 children. How to send ILR BRP?

[heyitsme]

I am applying for passport of 2 British Born children. I have received the naturalization certificate for both children. I currently have ILR. The HMPO asks for the ILR and parents passport to be sent with application. I wanted to ask

1) Do I need to submit both ILR AND passport or just ILR brp is enough?

2) I am making passport application for two children so I can only send my ILR/passport with one application. Do I include a cover letter explaining this? any tips?

[CR001]

If the children have been registered and have an certificate of registration, you do NOT need to send the ILR BRP card for the passport (this is for those born after a parent received ILR).