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I've just renewed mine and I spotted that the return address includes your application number, so I guess if you put both in the same envelope they will either:
1- (best case) figure it out and all be ok
2- (worst case) one renews and the other renewal fails and the passport is lost making renewal impossible and or long winded and painfulFor the cost of an envelope and stamp I'd just send separately.
I’ve just renewed mine and my son’s passports. Can I put the old ones in the same envelope to send them back at the same time or is that not allowed?