There’s also another, UK can already pre-order the device from Clove for just £495 (~$552).
The Moto Z ships from Amazon with free delivery in the UK (but no release date is given). There’s no shipping date available, but shipping is free in the United Kingdom. Also, there’s always the possibility for Amazon to offer some included Moto Mods in the retail package.
However, Amazon does offer their classical pre-order guarantee, meaning that if the price of the Moto Z will drop before your droid is shipped.