From Tim Needham.
"I took these photos earlier today in the churchyard at St. Treath in Cornwall, (See Pictorial catalogue of AZW Graves & Memorials) & the stone includes an inscription to a WILLIAM HENRY HOSKIN ALLEN who was killed in action at Isandlwana. I have found just 4 'Allens' in the casualty roll listed as having died there, & just one 'W' Allen, so I'm hoping this is him. According to both the casualty & medal rolls, 'W' Allen was a member of the Natal Native Contingent, although the latter lists him as both a Corporal in the 2nd Battalion & a Sergeant in the 3rd.
He does not seem to appear in Julian Whybra's 'England's Sons' however.
The other possibility of course is a mis-printing of his initial; the other Allens listed are: Sgt J Allen (2nd Btn NNC), Pte J Allen (2/24th) & Dvr H Allen (RA)"