Clive served in the Royal Signals and with Hertfordshire Constabulary before embarking on a career in military history in 1998. He first visited the battlefields as a child with his Grandfather and was regularly exploring the Western Front by the late 1980s. In addition to the publication of "Walking the London Blitz", " Wander through Wartime London" and "The Greater Game" he has contributed to Time Team, Time Watch, Blitz Spirit, CBS's Legacy of War and the BBC Centenary coverage for Gallipoli 100.
His specialist battlefield subjects are The Gallipoli Campaign, the Retreat of 1914 and 1918. The London Blitz and the Italian Campaign during the Second World War are also areas of specific interest. Clive is the holder of badge number 33 within the Guild of Battlefield Guides and was elected onto the prestigious British Commission for Military History in 2010.