October 17th will see the release of the Windows 10 Fall Creators Update and Microsoft’s Mixed Reality Headsets. You can now pre-order the two of the headsets from Currys/PC World. They currently have headsets from Lenovo and Dell available to pre-order with delivery October 17th.
The Dell Visor Headset costs £429.99 and comes with two controllers and the Lenovo headset costs £399.99 and also comes with two controllers. Other OEMS like ASUS, Acer and HP are also brining out headsets. I expect the Microsoft Store along with others like Amazon to open up pre-orders soon.