In 2020 the Alliance of Radical Booksellers began producing a series of fascinating newsletters about the history of radical bookselling, publishing and journalism. The latest newsletter includes a history of John Cobbett.
You can find these newsletters on their website: https://www.radicalbooksellers.co.uk/?p=652
Issue number 2 has an article on Days of Hope, Newcastle’s Left-Wing bookshop between 1975 and 1986. The article is by Martin Spence who was one of those running it for a number of years.