British passport supporting documents - one envelope or two?

[icebat]

Hello,

I need to send supporting documents for my two children British passports. Can I send them in the same envelope (clearly separating the bundles) or should I mail them separately?

Thank you in advance!

[icebat]

I have answered my own nonsensical question.

Moderators - could you please delete this thread, with many apologies.

Thanks!