Contributions to OUTSIDE IN 2: 125 MODERN PERSPECTIVES ON 125 MODERN DOCTOR WHO STORIES (ATB Publishing, 2015) and TIME UNINCORPORATED: THE DOCTOR WHO FAN ARCHIVES VOL. 3 (Mad Norwegian Press, 2011)

SHREK FOREVER AFTER: THE OFFICIAL HANDBOOK (Random House Children's Books, 2010)

DOCTOR WHO: THE COMPLETELY UNOFFICIAL ENCYCLOPEDIA (co-written with Chris Howarth, Mad Norwegian Press, 2006)

CUNNING: THE BLACKADDER PROGRAMME GUIDE (co-written with Chris Howarth, Virgin Publishing, 2000)

THE COMPLETELY USELESS STAR TREK ENCYCLOPEDIA (co-written with Chris Howarth, Virgin Publishing, 1997, serial rights sold to the Sun newspaper)

DOCTOR WHO: THE COMPLETELY USELESS ENCYCLOPEDIA (co-written with Chris Howarth, Virgin Publishing, 1996)

RED DWARF PROGRAMME GUIDE (co-written with Chris Howarth, Virgin Publishing, 1993; updated 1995, 1997, 2000; Japanese edition by Kawade, 2003 - A UK BESTSELLER)

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