Magnum Opus Press is based in London. You can contact us in various ways:
By email: hello@ magnumopuspress.com
By phone: in the UK 0776 016 5449; outside the UK +44 776 016 5449
By post: Magnum Opus Press, 5 Hatton Wall, Farringdon, London, EC1N 8HX
Please don’t drop in on us unannounced. There is nothing to see, we have no books for sale at these premises, and being publishers we are probably off having a long lunch somewhere.