no
The customer gave you the address and the royal maill couldn't deliver.
have you checked the postcode is correct? Technically all you need is the actual door number and postcode and they should be able to deliver it.
Put full postcode into say google map and street map and see if the street name matches (be careful as i know the post code for some london addresses are incorrect from personal experience when you do this)
Also the address does it have c/o or 1a, above smiths shop kind of adress which can mean nothing to the postie.
If you and the buyer are confident the address is correct, take up a complant with the postoffice (although not the best time of year to do this), you paid the post office to perform a simple task ie delvier a parcel which they didn't do, if they didn't do it they should refund you.
Many posties and delivery courier people are not going to waste time so just say unable to deliver, person not known. At this time of the year its even worse.
Had a problem with amazon recently where a courier company failed to deliver saying no one answered and then tried again the next day. got full refund and after a complaint got the parcel delivered on a saturday which they said at first they couldn't do but suddenly could when i got though to the depot and ripped into the duty manager.
Where is the customer roughly london , manchester maybe some one on here lives nearby and could verify the address for you?
Also what was the exact type of post office service you used?
