 Lascelles served in junior positions at the British embassies in Madrid, Paris, Rome, Washington D.C., and Athens.He was trained in the diplomatic service by Richard Lyons, 1st Viscount Lyons, and was a member of the Tory-sympathetic 'Lyons School' of British diplomacy.Lascelles was Consul-General in Egypt from 20 March to 10 October 1879, during the last years of the reign of Khedive Isma'il Pasha.