http://www.margaretthatcher.org/document/107332
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18036en.pdf
https://yougov.co.uk/news/2017/04/26/voting-intention-conservatives-45-labour-29-25-26-/
https://www.bruegel.org/wp-content/uploads/2022/02/PC-02.pdf