Adcock built up a literary career by unrelenting efforts in circulating his manuscripts, initially also working part-time as an assistant editor on a trade journal.
[2][3] He was a founder member in 1901 of Paul Henry's literary and performing club, with Robert Lynd, Frank Rutter and others.
[2] As an influential critic, Adcock has been classed with conservatives such as Hilaire Belloc, Edmund Gosse, Henry Newbolt, E. B. Osborn and Arthur Waugh.
[11] East End Idylls (1897), about the London slums, began an early trilogy, and had an introduction by the Christian Socialist James Granville Adderley, a friend.
A London Fantasy (1908) Adcock was the last editor of The Odd Volume (1917), an annual that folded during World War I.