Instructions:"From Thursday, November 17, 2016 till 23:59 GMT on Friday, February 17, 2017, New Amazon Student members get an extra £10 off their next purchase on Amazon.co.uk when they enter promo code APPRENTICE10 at checkout (the "Offer"). The Offer only applies to items dispatched from and sold by Amazon at the website http://www.amazon.co.uk. The Offer does not apply to purchases made from Amazon’s Warehouse Deals or from third-party sellers on the Amazon Marketplace. Each customer can only claim this Offer once and only one Offer per customer order."
I am an existing Amazon student member and the code didn't work, but it might for others.