Yes i'm in the UK. I managed to buy it the first time on a friday at 3:20pm, but my order was cancelled due to error in the shipping address.
On monday 18th (not tuesday as i said in my last post, im getting confused) at 11:20am I managed to buy it. Then I think tuesday or wednesday there were loads that flooded in and pretty much most people managed to get one. If you go back to the posts on tuesday/wednesday you'll be able to see the times that people scored them but it was popping up a lot. But this was the first time its ever happened so frequently so maybe there won't be so many available until the next round but honestly I could be wrong this is just an educated guess.
Peak times are 3-4:30am, 8am-9am, 10.30am-12pm, 3pm-5pm. This is just a broad estimate generally speaking, as they can appear at any times. For example I don't think anyone has encountered a restock at 7pm, it just never seems to happen. Good luck!! And keep an eye on this page as everyone is great at posting the sightings as soon as they appear