Lenovo has taken the Chromebook concept and bundled it into a high-quality 15.6-inch convertible laptop with a 360-degree rotating screen hinge. There's even a 4K screen in the offing, although this is not available in the UK at the time of writing. The only Yoga Chromebook C630 model currently on Lenovo's UK website has an FHD screen and costs £599.99 (inc. VAT).
Lenovo Yoga Chromebook C630 review at ZDNet