In 1901, we can see Henry living in Kent, England:

Henry Knibbs 22 Old Windsor Berks Kent Stoker
__________

In Memory of
Chief Stoker H G KNIBBS

292484(CH), H.M.S. "Brilliant.", Royal Navy
who died age 37 on 23 March 1916
Long Service and Good Conduct Medal. Son of James and Matilda Knibbs, of 4, Trafalgar Place, Old Windsor; husband of Lucy Sarah Ann Knibbs, of 16, Arthur Rd., Windsor.
Remembered with honour
WINDSOR CEMETERY, Berkshire

I'm not sure yet of the circumstances behind Henry's death but we know that he died in sick quarters at Lerwick in the Shetland Islands off Scotland on 23 Mar 1916 with what was described as Otorrhoea Lateral Sinus Thrombosis Embolism.

HMS Brilliant, the ship he was serving on, was a Light Cruiser which was deployed off the coast of Ostend and Zeebrugge. It took part in the fighting off the Belgian coast in the first months of the war. The Brilliant was then sent to the Tyne to act as a coastal defence ship, before being used as a depot ship on the Tyne (to 1915) then at Lerwick in the Shetland Isles. During the action off the Belgian coast, HMS Brilliant helped to rescue the pre-dreadnought battleship HMS Venerable after she ran aground.
She was later sunk as a block ship during the attempts to close the ports of Zeebrugge and Ostend.