Born 25 October 1889, the son of H A Costobadie, Lionel Palliser Costobadie was educated at his father's old school, Haileybury College, Hertford, from 1905 to 1908. He went to Gonville and Caius College, Cambridge, where he took his BA with 1st class honours in the Natural Science Tripos. He then entered the London Hospital as Price Scholar. He qualified with the Conjoint Diploma in 1914, took a house surgeon post at the London and then joined the RAMC. He served from 1914 to 1919 in Gallipoli, France and India, with the rank of Captain. After the war he took his Cambridge MB BCh, and moved to general practice in Folkestone, where he became honorary pathologist to the Royal Victoria Hospital. He took his FRCS in 1920, but did not practise as a surgeon. In 1932 he married Aileen, daughter of G. B. Wildinson of Folkestone. On the outbreak of the second world war he moved with his wife to Newbury, where he became medical officer of health to the West Berks Districts from 1941 to 1952. His interests were archaeology and painting, and he was a member of the Field Club. He died early in 1977. There were no children.