If you reserved a Surface Book after Microsoft opened pre-orders last month, then you're no doubt eagerly awaiting a courier's knock. Not nearly so organised? Well, not to worry, as we're here to remind you Microsoft's dual-personality device officially launches in the UK today. Part tablet, mostly laptop, the Surface Book is now available through Microsoft's store and at various other retailers, including Amazon, Currys / PC World and John Lewis. Bidding opens at £1,299 for the base, Core i5 model, but if you really want to make your wallet squeal, there's always the top-end configuration with Core i7 processor and dedicated NVIDIA GeForce GPU for a cool £2,249.