Hello friends,
Tesco relented on their return policy and I was able return a sealed NIS box for a copy of NSwB at no additional cost to me.
I opened the nice yellow box, only to find a laminated product key card and no emergency CD or USB stick inside.
Retail price is 37 pounds! Not a bargain, IMO.
Bottom line, is that you have to D/L the product to your computer and activate it using the Product Key. No offline, obviously.
I wish that they included a spiffy yellow "Norton" 1 GB USB stick for the actual retail cost of the product, to use in case of boot emergency and a method to keep it updated.
Better off buying the key via a trusted source on the Internet and having it emailed to you. Check for a sale!
FYI... 
Flavio_C