Cheapest I have seen this on Amazon in the past month.
Nintendo Wii U 32GB Premium Pack with Mario Kart 8 + Minecraft bundle
Nintendo Wii U 32GB Xenoblade Premium Pack - Black (Includes Exclusive Artbook and World Map)
However you get a free gamepad cover and hat from the official uk Nintendo store so maybe the Mario Kart one for £214.99 is the best one to go for.
Edit - Looks like the price has gone up to £225.87.