Start at https://www.aluminiumresearchgroup.com/

Most of his YT material has been purged, but Bitchute have some https://www.bitchute.com/search?query=exley

He was a critical of the adjuvant Aluminumhydroxid in vaccines. His laboratory at Keele University was closed down after they got a big donation from the new kid on the vaccine block, Bill Gates.