my experience
i sent my son passport to bootle on 4/4/2022 by royal mail,next day delivery.it should have been delivered 5/4/2022, still showing ready for delivery. i made a claim as lost on 13/4/2022, still waiting for result.
I had taken copy of that passport before sending original to passport office.i sent copy of that passport to passport office by royal mail, it was delivered and signed by passport office.
i think my son original passport was lost by royal mail.when i phoned to royal mail, they said number of document s delivered to passport office to high, not very document scanned. it seems to be not true.
regards