The Parents' National Educational Union (abbreviated PNEU), founded in Bradford, Yorkshire in 1887 as the Parent's Educational Union, was an organisation providing resources and support for homeschoolers in the United Kingdom in accordance with the educational ideas of Charlotte Mason. Mason was co-founder of PNEU together with Emeline Petrie Steinthal. The word "National" was adopted as part of the name in 1890.
References
Parents' National Educational Union Wikipedia(Text) CC BY-SA