Dell are aiming this at the educational market, although there doesn't appear to be anything about it that makes it especially suited or different from any other small Chromebook. The headline price is £159; however, this does not include VAT and once this is factored in the real price is £190.80, which still makes it the cheapest Chromebook to date.
Meanwhile, long term player Acer has released their C720 Chromebook. This is the successor to the original C7, but now has a SSD rather than the unusual (for a Chromebook) 320GB hard drive in the original C7. The battery life has been significantly improved, too, but the reduxed machine still comes in at under £200.