Looks like someone at MS was a bit keen with the website links. According to a port on Windows Central re-orders for the UK start tomorrow:-
"For the next version of Microsoft's fitness wearable, the Microsoft Band 2, the company says that those in the UK can start getting their pre-orders in starting tomorrow, October 7. The Band 2 will retail for ?199.99 through the Microsoft Store, and will be generally available for purchase starting on November 19."