He inherited his baronetcy in 1824 upon the death of his father Sir William Lemon, 1st Baronet and Carclew House.He attended Harrow School[2] Lemon served as Member of Parliament for Penryn in Cornwall from 1807 to 1812 and again from 1830 to 1831.[3] In 1836, he headed the petitioners from the town of Falmouth, Cornwall to the Admiralty, seeking to prevent the removal of the Packet Service.[4] In 1837, he was appointed to serve on the Transportation Committee of the House of Commons[5] In 1852 he became deputy Warden of the Stannaries and funded the establishment of what is now the Camborne School of Mines.[1][15][16][17] Tremayne was a hero of the Crimean War and a survivor of the Charge of the Light Brigade.