Found 10th Jun 2016
Enter the code at the checkout. this has been advertised at 12% but its 15% !!!! Valid on Dell XPS 15 9550-8076 Core i5 1TB Laptop, Dell XPS 15 9550-8090 Core i7 512GB Laptop, Dell XPS 13 9350-7741 Core i5 256GB Laptop, Dell XPS 13 9350-7765 Core i7 256GB Laptop, Lenovo Yoga 900-13ISK Laptop & HP Spectre x360 13-4108na Laptop.