Whether we like it or not, Amazon nearly always launches its new products and services in the US first. It happened with its Fire-branded tablets, set-top box and smartphone. The same can be said for its all-you-can-read e-book service, Kindle Unlimited, which after two months of availability stateside has today made its debut on the online retailer's UK store. For £7.99 a month, Amazon offers unlimited access to over 650,000 digital books (50,000 less than in the US) and thousands of audiobooks, which can be synced across e-readers, tablets and Amazon's numerous mobile apps. While you won't find books from many of the major publishing houses, Amazon does offer the Harry Potter and Hunger Games series, as well as a vast number of Kindle originals. Good news for jetsetters, commuters and maybe also Kindle owners waiting for Kindle Unlimited to launch in other European countries, but some already believe Amazon's new service poses a very real threat to local libraries.