Seems like ioi forgot that the PS4 didn't reach 2m in the UK until the final week of April, and not the first.
Won bet with t3mporary_126 - I correctly predicted that the Wii U's LTD at the end of 2014 would be closer to 9 million than 10 million. http://gamrconnect.vgchartz.com/post.php?id=6673287