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From royal mail website
How we deliver tracked mail
When we collect your Special Delivery item, either from your business or from the Post Office™ branch, we take it to our Mail Centre. There, Special Delivery items are separated from the rest of the mail, scanned to confirm we have received them, and put in to our secure network.
When we deliver your item to the address given we ask for a signature to confirm receipt. After the delivery person returns to their delivery office our online Track & Trace system is updated.
You can use Track & Trace to check that the item has arrived. In the near future you will also be able to see a Proof of Delivery online – a copy of the actual signature that was taken as receipt of delivery.