Anyway, it's in their T+C:
You will still be charged for the Item and for delivery in the event of a failed delivery if you have caused such failure for any reason. Reasons you might cause a delivery to fail include (but are not limited to):
You do not come to the door, did not pick up the phone when the rider contacted you using the contact information you have provided us and/or you picked up the phone but then failed to provide access within a reasonable amount of time, and the rider is unable to find a safe location to leave the food.
The rider refuses to deliver the Item to you in accordance with section 8 (Age Restricted Products).