The Doctor Who Discontinuity Guide

Paul Cornell is a writer of SF and fantasy in prose, comics and television, one of only two people to be Hugo Award-nominated for all three media. He wrote three episodes of Doctor Who for the BBC, Batman & Robin and Superman in Action Comics for DC, and a mature readers series at Vertigo called Saucer Country. His first urban fantasy novel, London Falling, about a modern undercover police unit in London accidentally becoming able to see dark magic and monsters, was published in 2012.
He lives near London, and his other interests include cricket, all things Fortean, and hisnewborn son Thomas. Martin Day has written eighteen novels, audiobooks and non-fiction titles, usually concerning television in general or Doctor Who in particular. He is a regular writer on BBC1's Doctors, having previously worked on Channel 5's Family Affairs and been lead writer on CBBC's Crisis Control.
He has also written plays, comic strips, short stories and journalism, and currently has a film in development in the USA. His hobbies include kendo, kickboxing, roleplaying games, and standing as an unsuccessful candidate in local elections. Full-time survivor, dandy highwayman, bon vivant, author, journalist and broadcaster yer actual Keith Topping's bibliography includes over 40 books; he was the co-editor of two editions of The Guinness Book of Classic British TV and has written or co-written volumes on TV series as diverse as The X-Files, Star Trek, The Avengers, 24, Buffy the Vampire Slayer, Angel and Stargate SG-1, as well as music and film critique.
He authored four Doctor Who novels (including the award-winning The Hollow Men, with Martin Day) and a novella. His work includes two editions of the acclaimed West Wing guide Inside Bartlet's White House, A Vault of Horror: A Book of 80 Great (and not-so-great) British Horror Movies, Do You Want to Know a Secret?: A Fab Anthology of Beatles Facts and Doctor Who: The Discontinuity Guide. Keith was a regular contributor to numerous TV and genre magazines and was a former Contributing Editor to DreamWatch.
He is widely considered one of Britain's foremost experts on the bewildering complexities of US network television. No, he hasn't the faintest idea why either.