An imprint of Ebury Publishing, a division of Random House (UK).
In December 2019, The Bookseller
reported that "Del Rey is the science fiction and fantasy imprint which currently sits with Ebury but which will now move across to Cornerstone. The move is part of a global PRH growth plan for science fiction and fantasy publishing, the publisher said. At Cornerstone, the imprint will partner closely with Del Rey in the US to acquire and publish more international brand authors."
A subsequent (paywalled) article in January 2020
reported that 'Cornerstone will launch a "newly imagined and resourced" science fiction and fantasy list, Del Rey UK, bringing together the rich SFF frontlist and heritage backlist titles from Cornerstone and from Ebury, Del Rey's previous home.'