Alongside launching the NOOK Simple Touch and NOOK Simple Touch GlowLight, Barnes & Noble has also made its NOOK HD seven-inch tablet available for pre-order.
The NOOK HD will go head to head with Amazon's Kindle Fire, Google's Nexus 7 and Apple's iPad Mini in the highly competitive small-screen tablet market.
UK consumers can now purchase the Barnes & Noble e-Readers - the NOOK Simple Touch and NOOK Simple Touch GlowLight - at retailers and online.
The NOOK Simple Touch offers a high quality, six-inch touchscreen with 'e-ink' - a text display technology that makes it easy to read in even bright sunshine.
Rather than a traditional LCD touchscreen, the display uses a layer of infrared beams to detect the user's touch gestures.
The eReader has been designed to be easy to hold, including ridges around the rubberised back that make it more comfortable to grip the device.
Barnes & Noble, which has a 27% share of the US e-Reader market, has aggressively priced the entry-level Simple Touch at £79, compared to £109 for the equivalent Kindle Touch.
In addition to e-ink, the top-end Simple Touch features GlowLight technology for reading while in bed. This integrated lighting solution features adjustable brightness for differing light conditions. The product is priced at £109.
Both NOOK eReaders weigh 200 grams and come with 2GB of internal storage - 1GB for the user and 750MB reserved to Barnes & Noble content. NOOK can hold up to 1,000 ebooks, and the storage can also be expanded.
The NOOK battery on a full charge gives two months of reading with the WiFi off, although this is cut down to one month in the GlowLight model if constantly using the backlight. Barnes & Noble's battery tests are based on around half an hour of daily reading time, while the GlowLight data was drawn from using the tablet at the default brightness setting.
NOOK connects via WiFi to the NOOK Store, offering more than 2.5 million digital books ranging from bestsellers to self-published titles, along with magazines and newspapers such as Good Housekeeping, Marie Claire, Men's Health, Cosmopolitan, and The Independent. Any purchased NOOK content is stored in the NOOK Cloud.
Both e-Readers are available for purchase at John Lewis, Argos, Asda, Sainsbury's, Dixons and Waitrose, Blackwell's and Foyles, along with online.
"We're thrilled to be able to bring our award- winning products and expansive NOOK Store to the UK's discerning customers," Jamie Iannone, the president of NOOK Media, said.
"The NOOK brand was created for people who love literature and reading, which is why the UK was a natural place for us to begin our international expansion.
"Our extensive content catalogue, intuitive shopping and reading experience, and breakthrough discovery tools like NOOK Channels are a perfect fit for UK digital book readers."
Also today, Barnes & Noble has started advanced orders of its colour-screen tablet devices at the NOOK UK website.
The NOOK HD is claimed to be the lightest and most high resolution 7-inch tablet in the world, while the NOOK HD+ is a cheap and high spec 9-inch slate. Both are WiFi-only tablets, and will go on sale in the UK this autumn.
Available in 'Snow' (white) and 'Smoke' (grey) colours, the NOOK HD will cost £159 for an 8GB storage model and £189 for the 16GB version.
This is more expensive than the Kindle Fire HD, which costs £159 for the 16GB version, but is much cheaper than the equivalent iPad Mini models.
The pricing gets even more aggressive with the NOOK HD+, which comes in 'Slate' (black) and costs £229 for the 16GB and £269 for the 32GB - around half as expensive as comparable iPads.
The NOOK slates, which also come with expandable memory for more storage via microSD, are expected to go on sale in UK retailers next month.
> Barnes & Noble bringing NOOK HD tablets to the UK - feature