Why isn’t Scion of Cyador available in ebook form in Great Britain?

Scion of Cyador isn’t available there because of the complexity of subsidiary/foreign book rights. Orbit, a division of Little Brown, purchased the British print rights to the book more than a decade ago,but did not purchase electronic rights. Although the book does not appear to be in active print in Britain, as I understand it, the print rights preclude “other editions” being published. Because Scion of Cyador is not in active print, Tor/Macmillan is in the process of reverting the rights, at which time an ebook edition will be available in Britain.