This is the new Popcorn Hour C-200 from Syabas. It features a number of improvements over the fantastic and highly successful A-100/A-110 model, including the ability to fit in a blu ray drive, a new graphic chip, significantly more processing power and RAM which should result in applications to run faster and may also improve some aspects of video playback (e.g. supported types of files), 2 SATA trays instead of one, a wireless remote, an LCD screen, etc.
Please note, this product has just been released and this is a pre order price. If you don't want to wait, I believe Ripcaster claims to have some in stock for £299.99 (probably best to call them to check though). If you want to order direct from the manufacturer, I think it will cost you just under £260 ($300 for the device + $50 delivery to UK + $61 import duty to the UK @ 17.5% = $411.25 / c. 1.60 USD / GBP exchange rate) and you will most likely be subject to some delays as well + you will not benefit from the same legal protections than if you buy from a UK retailer.
Note: 4% Quidco / Topcashback should be available on this too. The 10% discount code "jolly" does not appear to work though.