The "virtual signature" obtained by UK Royal Mail involves the person who delivers the packet "confirming" on an electronic device that it has been delivered. That merely proves that it has been delivered SOMEWHERE.
I recently found a "recorded delivery" packet behind a flowerpot in my front garden. It was addressed to a house at the other end of the road, so I wrote a note on the front saying where I had found it, and put it through their letter box.
If the sender had checked the tracking number online they would have been told "We've got it" and given the time it was sent and the address of the post office that took it in.
They would be told that they would not be given any further information until Royal Mail had attempted to deliver the packet.
I know this because about six weeks ago I sent a small parcel by first class Signed For delivery. It has still not been delivered, and the website is content to tell me that they have still "got it". It is probably lying somewhere between here and Edinburgh. I doubt it will ever reach its destination.