Time and Time Again
by Ben Elton (Bantam, 2014)
An ex-soldier is sent back in time to prevent World War One. Elton’s focus is less on changing history, more on the contrast between today’s spoiled society and the boundless potential of yesteryear… until this perfectly paced paradox novel hits its straps.
A Rebel in Time
by Harry Harrison (Granada, 1983)
Nominally a paradox novel, A Rebel in Time was notable for bringing Harrison’s refreshingly liberal values to the field of adventure science fiction: a black army sergeant pursues a racist colonel back through time to the outbreak of the American Civil War.