Looking like a Brexit it is.
Of course it could change, but around 04:00 GMT, some of the big cities are in (Edinburgh, which is most of Scotland) and turnout has been lower than expected in the remain areas, and win margins have been lower.
On the flip side, in places like Newcastle, the vote was MUCH closer than expected, and in some leave areas, the win was by a substantially higher margin than expected.
News reports from some insiders are that the UK gov't is anticipating an Brexit win, and on the BBC news they are reporting the leave campaign are saying they believe they have likely won.
The big unknown is London - where a huge number of the population of Britain lives. That outweighs Scotland, Wales and all the non-contiguous lands. On the other hand, Northern England has swung Brexit quite a lot harder than it was expected.