Non-fiction
The Desert Fathers: Sayings of the Early Christian Monks, translated and with an Introduction by Benedicta Ward (2007)
The Desert Fathers: Translations from the Latin with an Introduction by Helen Waddell (2007)
The Faerie Queene: a selection of critical essays, edited by Peter Bayley (2011)
The Johnstown Flood, by David McCullough (2021)

Non-genre
The Mermaids Singing, by Lisa Carey (2012)
The Commissioner, by Stanley Johnson (2016)

SF
The Romance of the Three Kingdoms, attributed to Luo Guanzhong (2015)
The Master and Margarita, by Mikhail Bulgakov (2020)
The Monk, by Matthew Lewis (2022)

Doctor Who
Doctor Who: Planet of the Ood, by Keith Temple (2024)

The Best
The Johnstown Flood – magisterial account by the great David McCullough in his younger days of a man-made disaster that wiped out a town in Pennsylvania in 1889; one of the victims was the uncle of my as-yet-unborn grandmother. A book of both its times, ie 1889 and 1968. (Review; get it here)

Honorable mentions:
The Desert Fathers, Waddell translation – the thoughts of the saints who isolated themselves in the desert are by definition a bit dry, but Helen Waddell invests them with humour and sympathy. (Review; get it here)
The Master and Margarita – one of the great Russian fantasy novels of that creative period soon after the Revolution. (Review; get it here)

The one you haven’t heard of
Even though it was made into a film starring John Hurt, the original novel, The Commissioner, by Stanley Johnson (father of Boris) is not that well known (only 11 owners on LibraryThing, 10 ratings on Goodreads). A tale of Brussels skullduggery in more innocent times. (Review; get it here)

The ones to avoid
I’m leaving this category clear again; none of the above is awful. I didn’t gel with Three Kingdoms, but that’s on me at least as much as the writer and translator. There are enough ghosts and sorcery for it to qualify as sf above. (Review; get it here)