Digital Collections of sources related to the British working class:
The Digital Panopticon, which allows you to search millions of records from around fifty datasets relating to the lives of 90,000 convicts from the Old Bailey. Look at trial outcomes, transportation records, convict tattoos, and more. https://www.digitalpanopticon.org/
Burnett Archive of Working Class Memoirs, includes more than 230 digitized memoirs written by members of the British working class https://bura.brunel.ac.uk/handle/2438/7356
Modern Records Centre at the University of Warwick, which is the the main British repository for national archives of trade unions and employers' organisations, and also has strong collections relating to pressure groups, fringe political parties and transport. https://warwick.ac.uk/services/library/mrc/
Marxists Internet Archive Library, for primary sources written by and about prominent socialist activists https://www.marxists.org/archive/index.htm
