I know this is very late, but when you are next in Cornwall, there is plenty for you to have a look at. Apart from Melvill, I can think of another 7. This little lot will have you running all over Cornwall.
Francis George Eyre, Midshipman HMS Boadicea, Grave at St Stephen's Parish Churchyard, Saltah, Cornwall.
Charles John Coar, Senoir Chaplian, Grave & Memorial Window at St Ive Parish Church, St Ive, Cornwall.
James Steward Douglas, Lieutenant Royal Artillery, Grave at Portscatho Parish Church, Portscatho, Cornwall.
Sir William Penn Symons, 24th Regiment, Stained Glass Window and Plaque at Botus Fleming Parish Church, Cornwall and a Memorial Obeslisk at Victoria Gardens, Saltash, Cornwall
Edmund Leopold Pelly-Clarke, Captain 103rd Regiment, Memorial Plaque at Mawgan-in-Meneage Parish Church, Mawgan-in-Meneage, Cornwall.
Charles Edward Le Mesurier Cherry, Captain 32nd Regiment, Listed on the Egyptain Campaign Memorial, St Petrock's Church, Bodmin, Cornwall.
Henry Sparke Stabb, Major 32nd Regiment, Memorial Window, St Petrock's Church, Bodmin, Cornwall.
All the above took part in the Zulu War.