Indicia says issue #5, cover says issue #50. Cover matches issue #50 of Fawcett series. No published date in indicia, copyright of 1950. American issue published in August 1950. Unknown if contents match contents of American issue, but likely not. The words "Big 52 Pages" have been removed from cover, so it's likely 36 pages.
Art credits from GCD index of original issue.
Also includes indicia for issue. Address for Derby Publishing is not the same as Modern Distributors Limited, but at 424 Wellington Street West.