The brief article about his death was syndicated in several British newspapers, and I asked about him in the online King's Lynn Forum, Grimston being about 7 miles east of King's Lynn. The inscription on the family gravestone, in Grimston churchyard, reads "Robert Collison, killed May 29th 1901, aged 24 years." His father was James, died November 1900, aged 75, and mother Betsy died in 1908, and 63. I'm told that he doesn't appear on the medal rolls; his father pre-deceased him, so did his mother, in her late 50s, decide not to apply for his QSA?
DEATH FROM LIGHTNING.
A Lynn correspondent states that Robert Collison, a Norfolk Militiaman, recently invalided home from the front, was killed by lightning on Wednesday night while sitting at the open window of a public-house in Grimston, near Lynn. Two companions were also struck, but escaped with only slight injuries.
Portsmouth Evening News, Thursday 31st May 1901
The photo of his grave in the King's Lynn Forum was very kindly supplied by Steph and Ian Hall, of Grimston, and I thank them and the others who have contributed to the thread on the KLF for digging up so much information on Robert.
His age on the gravestone is 24, but the burial record has it as 25.