The MHRA Style Guide Online
A Handbook for Authors and Editors • Third Edition
From Chapter 6, 'Capitals'
Capitals should be retained after the prefix in hyphenated compound forms such as:
anti-Semitism, neo-Aristotelian, non-Christian, post-Darwinian, post-Impressionism, pre-Columbian
Both parts of the compound are capitalized in ‘Pre-Raphaelite’.
The following unhyphenated forms, uncapitalized or capitalized as shown, are preferred:
neoclassical, neocolonial, neorealism, neoscholastic
Neoplatonism, Nonconformism, Presocratic
Archaeologists and historians, when referring to prehistoric eras, usually write them as one word, capitalized when a noun but not when an adjective:
before the Neolithic, neolithic sites
In titles and headings, all parts of the compound are normally capitalized:
Anglo-Jewish Studies, Non-Christian Communities, Seventeenth-Century Music, Post-Classical Literature
However, only the prefix is capitalized if both parts are essentially one word in hyphenated compounds formed with re-: