The trader is responsible for goods until you receive them, or someone else you have nominated (e.g. a neighbour) has them delivered.
This means that if there is a problem with the delivery, or something happens to the goods in transit, the trader, not the courier must sort it out.
Deliveries must happen within 30 days, unless agreed otherwise. If the trader fails to deliver within the 30 days, or a different time period you have agreed to, your rights will depend on whether time was of the essence:
If it was essential that the goods were delivered on time, you have the right to cancel the purchase and get a full refund.
If the delivery was not time-essential, but another reasonable delivery time cannot be agreed, you are also within your right to cancel the order for a full refund.
Delivery restrictions must be specified at the beginning of the shopping process, for example if an online retailer states there is no express delivery option for Northern Ireland.