(Ethel) Lilian Heatley was born in 1880 at Over, Cheshire, and was the daughter of a local farmer and his wife. In 1907 Lilian married the artist Harold Swanwick, who had a similar upbringing nearby. They moved to Sussex and Lilian kept diaries in the years following her marriage; those for 1908 and 1909 are held in the East Sussex Record Office at Falmer. Lilian was an amateur painter of landscapes, inspired by daily walks on the Sussex Downs as well as picturesque subjects further afield. She and Harold bought Twytten House in the village of Wilmington near Eastbourne in 1912 and would continue to spend their lives there, though both enjoyed travel and painted abroad. They had no children and Lilian was widowed in 1929. She would go on to donate examples of her husband's work to UK collections, including the British Museum.