TESCO – Horncastle – Opening Hours & Store Details You can visit TESCO Superstore on Water Mill Road, approximately 0.32 miles north-west of the centre of Horncastle (nearby Bain Valley Park and Queen Elizabeth’s Grammar School). Patrons can easily travel here from West Ashby, Thornton, Stow’s Corner, Thimbleby, Edlington, Overton’s Corner, Hangman’s Corner and Horncastle Town Centre. Please review the sections on this page about TESCO Horncastle, including the open hours, local navigation, direct number and further details.