Seems £30+ elsewhere.
Also get £1 credit -
"Enjoy £1.00 credit to spend on movies or TV on Amazon Video when you purchase a DVD or Blu-ray offered by Amazon.co.uk. A maximum of 1 credit per customer applies. UK customers only. Offer ends at 23:59 GMT on Wednesday, November 30, 2016 (Terms and conditions apply) "
Aaaaand... Part of the £10 off £50 spend in DVD/BluRay.
"Receive £10 off your purchase when you spend a minimum of £50 on select DVDs and Blu-ray. Terms and conditions apply. (Terms and conditions apply) "
The Complete 8-Film Collection (16-discs):
Year 1: Harry Potter and the Philosopher's Stone - The magical adventure begins when Harry Potter is to attend Hogwarts School of Witchcraft and Wizardry.
Year 2: Harry Potter and the Chamber of Secrets - Cars fly, trees attack and a mysterious house-elf warns Harry of great danger as he returns for his second year.
Year 3: Harry Potter and the Prisoner of Azkaban - Harry must confront soul-sucking Dementors, outsmart a werewolf and learn the truth about the escaped prisoner of Azkaban - Sirius Black.
Year 4: Harry Potter and the Goblet of Fire - Harry must overcome a deadly dragon, fierce water demons and an enchanted maze only to find himself in the cruel grasp of He Who Must Not Be Named.
Year 5: Harry Potter and the Order of the Phoenix - When few believe that Lord Voldemort has returned, Harry must secretly train his friends for the wizarding war ahead.
Year 6: Harry Potter and the Half-Blood Prince - As Lord Voldemort tightens his grip on both Muggle and wizarding worlds, Harry and Dumbledore work to find the key to unlock Voldemort's defenses.
Year 7 - Part 1: Harry Potter and the Deathly Hallows, Part 1 - Harry, Ron and Hermione set out to track down and destroy the secret to Voldemort's power - the Horcruxes. On their own and on the run, the three must rely on one another more than ever...but Dark Forces threaten to tear them apart.
Year 7 - Part 2: Harry Potter and the Deathly Hallows, Part 2 - In the epic finale, the battle between the good and evil forces of the wizarding world escalates into all-out war. The stakes have never been higher and no one is safe. But it is Harry who may be called upon to make the ultimate sacrifice as he draws closer to the climactic showdown with Lord Voldemort. It all ends here.