The annual Transactions of the Unitarian Historical Society have been published continuously since 1917. A full list of the articles and notes contained in the Transactions from 1917 to 2017 (including supplements) can be read here
Anyone wishing to submit an article should contact the editor (see below) with the details of their proposal, including a rough summary outline, stating possible length, timescale for possible submission and their academic or other affiliation/interest in the pursuit of dissenting history.
Editor: Transactions of the Unitarian Historical Society
Rev Dr David Steers
223 Upper Lisburn Road
Editor's Blog: https://velvethummingbee.wordpress.com/