Unique Code?
In the blurb on the Play Store I read
"Once you’ve purchased a printed map and redeemed the unique code, you can download your map tile and save it for future reference in ‘My Maps’ on your device."
This sounds good for the future - buy a paper map and get a free digital copy - but makes those of us who have previously bought maps feel a little hard done by.
However, apart from going into a shop and having your map stamped with a unique code I can't immediately see how you could compensate those with a stash of OS maps.