Board Thread:The Panopticon/@comment-1293767-20151029072618/@comment-26469787-20151207050951

Digifiend wrote: In retrospect, it looks like a three parter to me. The "previously on" segment on Hell Bent referred to both of the previous two episodes and Hell Bent directly followed on from Heaven Sent for the Doctor and Face the Raven for Clara.

If that qualifies Face the Raven as part one of three, then we would be obliged to make Closing Time part one of two, as it suits your template for determining episode status.