Warner Bros. have announced a mammoth new 31-disc Blu-Ray box set called 'Harry Potter Wizard's Collection', and we've nabbed an unseen DVD extra featuring Rupert Grint and Alan Rickman.

Our EXCLUSIVE video sees Grint and Rickman share an awkward memory from the earlier years of the film production. Cringe!

The 'Wizard's Collection' features all previously released content plus more than four hours of never-before-seen exclusive material, like our clip.

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The box-set boasts all eight films on Blu-Ray (and UltraViolet digital copies), plus 37 hours of extras.

The films are presented in a massive gift box weighing in at 19 lbs. 'Artistic and authentic film memorabilia' is also included.

The box-set doesn't come cheap, costing a whopping £259.99 (RRP), so start saving now for a September 10 release.