UK carrier EE has exclusivity on the Arctic Silver color option of the Samsung Galaxy S8 and has now started taking pre-orders.
With its best-selling plan, you pay £30 up front for the phone and then £48 a month for two years. You get unlimited texts/calls and 2GB of data. Again, this is a pre-order, as the phone will be dispatched within 14 days.
There’s no SIM-free option, however. Amazon UK does have some units, the cheapest of which is £513 + £17 delivery. Note that these usually ship from Italy.