All books are available in paperback and digital form from Amazon.com and Amazon UK
Click on the images below for more details 

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Black Hart (YA and Adult Thrillers, Sci-Fi, Horror and Non-Fiction)

Oxford University Press (Children, Teen and Young Adult)

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Penguin's Random House, Black and White and Amberley Press (Non-Fiction)

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Collins, Floris Books and Anthologies