We're almost into April and I'm pretty sure Sony (or someone) would release a 2 million in UK announcement, so I think as of January 24th, it would be PS4 - 1.8m and Xbox One 1.5m.
Also 1.9 + 1.5 is 3.4
The point is 1.5m maximum for Xbone because a number over that will give a gap below 300k... and 1.8m minimum for PS4 because a number below that will give a gap below 300k too.
The gap needs to be over 330k.
So maybe more close to 1.45m and 1.85m for Xbone and PS4 respectively.