The ill-fated mountaineer George Mallory's only book was "Boswell the Biographer"?
Thomas Robinson - 1st Baronet of Rokeby
Thomas RobinsonBorn ca. 1702
Son of William Robinson of Rokeby and Anne Walters. Married (1728) to Elizabeth Howard (1701-1739), dau of Charles Howard (1669-1738), 3rd Earl of Carlisle, and Anne Cappell (1683-1752). Governor of Barbados (1742-47). During his time on Barbados he married a local girl, who refused to go back to England with him when he left the island in 1747. Sometime Master of Ceremonies at Ranelagh Gardens. A keen amateur architect, he built some churches including St. Mary the Virgin in Glynde (Link).
I am pretty sure this identification of Sir Thomas Robinson is correct, although Boswell may be referring to the 1st Lord Grantham (1695-1770) sometime secretary of state. There seems, however, to be some sort of family relation between the 1st Bart of Rokeby and Johnson (Link), and Boswell refers to Tall Sir Thomas Robertson in the Life of Johnson, which seems to correspond with the Bart of Rokeby as well (Link).
An article on the Admiralty in Ackermann's Microcosm of London (1809) read that "The figure of Sir Thomas Robinson must be in the recollection of many of our readers; --- so long, so lank, so lean, so bony, that he struck every one who saw him, as distinct from all other men, and out of all manner of proportion. When the late Lord Chesterfield was confined to his room by an illness, of which he felt a consciousness that he should never recover, a friend, who visited him in the character of one of Job's comforters, gravely said, he was sorry to tell his lordship, that every body agreed in thinking he was dying ,and that he was dying by inches. "Am I?" said the old peer, "am I indeed" why then I rejoice from the bottom of my soul, that I am not near so tall as Sir Thomas Robinson." ". (Link)
Boswell called on Dr. Johnson on July 18, 1763, and found Sir Thomas Robinson with him.