The BPPO 2011 Christmas issue FDC use the "Tudor" cover. The reason behind this being that the Tudor period began a major division between the protestant and catholic faiths. At the same time religious intrigue spurred developments in cryptography, particularly during the Elizabethan period. The stamp theme of the "King James bible" represents the way those changes still impact on religious thinking today.
The stamp cancelled using a Bletchley Park Post Office CDS.
Never to be used again now that post office has closed.