Urgent! Any Royal Mail workers can tell me what this means? Signed for XP1? Sent small letter relating to a legal dispute

[Ghoulette]

Long story short, I am in the middle of a dispute with someone and had to send a legal document to them (They live a couple of doors up from me). I had it sent first class signed for and got a tracking number so I could see when it had been delivered to make sure this person received it and couldn't dispute it.

Postie arrived at my door so I went to check the tracking number and it says Signed for by: XP1. It then says in the tracking information Delivered and Signed but then underneath is says "Local" DO (delivery office)

What does this mean? Does it mean my postie signed for it on my behalf but then buggered off with it back to the delivery office? Will I now have to send the letter again if I want any hope of it actually getting to the person it needs to? As if it is at the DO they could just decide not to pick it up and I would never know if they actually got it or not.

Sounds like the recipient wasn't in originally and went to collect it at the local DO, where the counter staff would have signed with XP1?
If it hadn't been delivered anywhere it wouldn't have an Xp1, and would probably show as attempted delivery - awaiting collectíon or something.

OK good, thank you :)

What concerned me is that it changed to that status literally as soon as the postie had passed my house so it couldn't have been at the delivery office at that time. Going to assume, for now, that they received it and all is well (I will need a reply from them legally so we will see).

If it changed as he went past the house, the postman may have just signed for it himself and shoved it through the letterbox.

Our posties don’t allow you to sign for stuff just now. They sign on your behalf, even if you’re in.

Our posties haven't been taking signatures since the pandemic started. They sign themselves

The postie will sign for it themselves.

XP1 means it was delivered and the post worker signed for it, because they can’t have the general public handling their computer device thing (pandemic)