The PS4 is kicking butt in the UK and according to one website, Sony sold nearly double the number of PS4s there in its launch weekend than Microsoft sold Xbox Ones upon it release weekend.
Chart Track (a UK tracking website) has said (without giving any numbers) that the PS4 is officially the fastest selling console in the UK and that it eclipsed previous records held by the PSP, PS3 and the Xbox One. Given that over 180,000 PSP units were sold on launch there, we know that the PS4 must have sold at least more than that.
On the other hand MCVUK has given out some specific sales numbers, saying that 150,000 Xbox One units were sold versus 250,000 units of the PS4. We note that these numbers are not confirmed however.
Either way, it appears that the Playstation is well and truly dominating the competition in the United Kingdom.