Subjects covered include crop circles, ESP, life after death, time anomalies and spontaneous human combustion.
She has also written skeptical investigations solving cases - including, co-authored with Dr David Clarke and Andy Roberts, The UFOs That Never Were (London House, 2000).
Randles has written articles for many publications including New Scientist, and has sold more than 1.5 million copies of her published books.
Its special on the Rendlesham Forest case, which Jenny was one of the first to investigate shortly after it happened, obtained over 12 million viewers, and became the most watched programme on the subject on UK TV.
She coined the term, 'Oz Factor', describing the odd state of consciousness involving changes to the perception of time and space, during which strange phenomena and close encounters can occur.