We use TNT as our preferred courier company although we do sometimes use other reputable carriers. It is standard practise for commercial carriers to require a signature on delivery.
If there is nobody there to take delivery the carrier will likely leave a card and attempt to re-deliver the following day. You can also call the number on the card where you can organise another delivery, or if you prefer to collect from the local depot.
Ultimately it is down to the drivers discretion whether to leave the consignment and so we cannot accept responsibility for late or failed deliveries if there is no one available to accept the order when the delivery is made.