David Tennant, David Bradley, and David Morissey have all played the role of the Doctor from Doctor Who, David Tennant as the Tenth Doctor from 2006-2010, David Morissey in The Next Doctor, and David Bradley playing William Hartnell as the First Doctor in An Adventure in Time and Space.
David Tennant and David Morrissey would both work together later on Doctor Who the Christmas episode "The Next Doctor."
David Tennant's performance in Blackpool caught the eyes of Doctor Who producers. Coincidentally, in one scene in Blackpool, Tennant can be seen walking past a Doctor Who-themed museum.
Exterior school scenes were filmed at the old international university building in Bushey, Hertfordshire