I now know, courtesy of a post on nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqke2g8yhwxtxr68vj75974l2kwu4thlkusdsmcvcgr5schpa5atrq08l029 (nprofile…l029)’s blog – https://www.taxresearch.org.uk/Blog/2025/03/26/from-centre-right-to-hard-left/ – that it was a letter to The New Statesman in 2023
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