Harry Potter Special Presentation Pack From Royal Mail
The Dumbledore and Voldemort stamps have been taken from the Magical Realms set of stamps, issued by Royal Mail in February this year, that also featured characters from the likes of the tale of King Arthur, the Chronicles of Narnia and Terry Pratchett.
The Heroes and Villains pack features five stamps of both Dumbledore and Voldemort in a specially created stamp set:

You can see and purchase the special pack from the Royal Mail via their eBay shop: The Special Harry Potter Presentation Pack on eBay
The timing of release of this special pack, to coincide with the final Harry Potter movie DVD release, could make this pack a popular stocking filler for younger Harry Potter fans. If this leads to a wider interest in British stamps among young people then that can only be a good thing for the hobby.
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