It's not that unusual that some stores end up breaking street dates for AAA titles, but this one might take the prize. Uncharted 4: A Thief's End is scheduled for official release on May 10, exclusively for PlayStation 4, but it seems that some English shops have already sent copies to consumers.
It may be related to the fact that the previously slotted as April 26, until the final delay that saw the game pushed to May 10. This might have caused some confusion in the shiping system, and the game was probably unlocked for shipment to consumers. According to several reports on NeoGAF, both Amazon UK and Germany have already sent out copies of Uncharted 4, but it seems that there are other shops who are also breaking the street date.
Sony will certainly not be happy about this, since we're not even close to review embargoes, and retailers tend to frown upon having to hold back selling copies of a game as their consumers can get them elsewhere. With Uncharted 4 reportedly out in the open, we strongly advise caution if you want to avoid spoilers.