http://www.radiotimes.com/news/0201-01-02/doctor-who-mark-gatiss-reveals-casting-for-an-adventure-in-space-and-time

Mark Gatiss has revealed that David Bradley (Argus Filch, Walder Frey, etc.) will be playing William Hartnell in An Adventure in Space and Time, the dramatisation of the creation of Doctor Who due to air later this year. Brian Cox - no, not the physicist, the Shakespearean actor! - will play Sydney Newman, the producer who, alongside Verity Lambert, created the show.

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According to Gatiss' own Twitter account, there will be more casting announced tomorrow!