The Modern Records Centre [MRC] at Warwick University has digitised 100,000 pages of union journals. 

Since shifting its approach on digitisation to make as many union journals as possible available online, the MRC has managed to scan a vast quantity of material and make it available free of charge to researchers Link to a blog from the Society for the Study of Labout History

 https://sslh.org.uk/2022/09/12/from-new-dawn-to-labour-prophet-taking-union-journals-to-a-wider-audience/

Direct link to the MRC database https://warwick.ac.uk/services/library/mrc/archives_online/digital/unionjournals/