These Dents have been treated in this group before (including by Richard, here -
) so thought a look at them would be worthwhile; didn't seem to be any link to the Dents I could check from BFI.
Robin Francis Congreve Dent younger brother of Capt. John Arthur Willan Dent (to whose wife the above linked thread pertains), per the London Gazette apparently of the Welsh Guards (at least at the outset of his military career). They were sons of John Ralph Congreve Dent (1884-1969), of Olivers, Painswick, Glos. (see, again, the linked thread for more details) and his wife Margaret Honor, dau. of Arthur T. Keen, of Harborne Park, nr Birmingham, a director (sometime chairman) of Guest, Keen & Nettlefolds, for details of which steel business see
https://en.wikipedia.org/wiki/GKNJ. R. C. Dent (apparently third) s. of Joseph Henry Dent (1849-1895), of 30, Augustus Road, Edgbaston, Birmingham, formerly of 2, Park Terrace, Darlington, Durham, banker ('bank manager' per probate record, 'bank accountant' per 1881 census), and his wife (m. 1873) Annie Lucy (1852-), dau. of George Thomas Congreve, of Rye Lane, Camberwell, Surrey, and of Peckham, druggist.
J. H. Dent (apparently fourth) s. of John Dent (1805-), of Leyburn, Yorks., per census records at once 'grocer and draper, mining agent and actuary of savings bank', by his wife Catherine. Of John Dent some detail is provided by the laboriously-titled "The Poets of Yorkshire; comprising sketches of the lives and specimens of the writings of those 'children of song' who have been natives of, or otherwise connected with, the County of York", John Holland (1845): 'JOHN DENT was born at Leyburn, in the North Riding of Yorkshire, June 11th, 1805, at which place he now resides, a married man with a family, and carrying on business as a respectable draper. Having had an education suitable to his station in life, Mr Dent has, almost from his very boyhood, been a scribbler of verses; nor has the predilection been obliterated by the cares of business and the obligations of social life. Having a mind sensitively alive to the beauties of nature; living in such a romantic and beautiful valley as Wensleydale; and being, from these and other circumstances, partial to a country life, several of his effusions are naturally of a rural character. They indicate a genuine poetical feeling, and have all a moral tendency. The only piece Mr Dent has published in a separate form is "An Elegy to the Memory of Peter Goldsmith, M.D.", but several of his effusions, under the signature of "Zeta", have appeared in the "Court Magazine" and other periodicals.'
There were numerous John Dents born around that time in Yorkshire, but none I could locate specifically at Leyburn.