The "Cambridge Review" of Oct. 25, 1906, mentions "W. Hope-Jones" as a member of the General Committee of the Cambridge Church Society, King's College. He appears to have been a notable foot-racer.

The"Eton College Chronicle" of Oct. 17, 1907, mentions "W. Hope-Jones, Esq."

More interestingly, Hope-J`ones appears as a character in M. R. James's story, "Wailing Well," "first read at a camp of Eton Boy Scouts" in July, 1927.

Wikipedia has an entire article on "The National Anthem of the Ancient Britons." It asserts that William Hope-Jones, a housemaster at Eton, "sang it at a College dinner" in 1914, but it first appeared in print in the "Hackney Scout Song Book," as noted by Dave Earle above, in 1921.

According to his obituary in the "Mathematical Gazette" (1965), Hope-Jones was the "greatest personality" in the Mathematics Association "of the past 40 years":

"Probability, he said, was a bee which buzzed in his bonnet, and he paid full heed to the implications of the theory. When it showed him that if 36 runners enter for a race, for which there are 6 prizes, 4 heats of 9 runners with two from each heat in the final will be more likely to give a fair result than 6 heats of 6 runners with one from each heat in the final, he took a large spade and widened the road where the Eton school mile starts, so as to make room for 9 runners....

"To know H-J was a tonic, a corrective to pessimism The world became a simpler, brighter, happier place when he was present."