First published in 1940. This copy is not dated, but using the recently published books printed inside i date it in the early 1940s. An advert for Mars inside states that 'Zoning now restricts Mars to the Southern Counties. So here's hoping for quick victory - and plenty of Mars for everyone - everywhere.', also pointing to a printing date of early 1940s.
Adverts inside and on the covers are Oxo, Mars, Bravington's Jewellers, Cadburys and The Pelman Institute.