Formby is a town and civil parish in the Metropolitan Borough of Sefton, Merseyside, England. Historically in Lancashire, three manors are re…Formby is a town and civil parish in the Metropolitan Borough of Sefton, Merseyside, England. Historically in Lancashire, three manors are recorded in the Domesday Book of 1086 under "Fornebei", Halsall, Walton and Poynton. Cockle raking and shrimp fishing lasted into the 19th century. By 1872, the township and sub-district was made up of two chapelries, Birkdale township, the hamlets of Ainsdale and Raven-Meols and Altcar parish. Formby was built on the plain adjoining the Irish Sea coast a few miles north of the Crosby channel.