Thank you lewlewduckie. That’s very useful to know about the lack of tracking, and not needing the signature – I had a feeling that must be the case or else the email from the PO about having printed and sent the passport would provide the relevant guidance for tracking.
The delivery details seem to vary. I checked with my neighbour. He renewed his passport in February, before lockdown. His passport was delivered by TNT three days after the ‘printed and sent’ email from the PO. No tracking either, but he had to sign for it – probably because it was the first time he’d had a passport sent to that address (he only moved in late last year).
One question: when your passport arrived, did it have a separate TNT consignment number on the envelope? Or just the Passport Application Number starting PEX?