OMG, IT'S SO FRUSTRATING. I'm in the same exact position as you. He was such an extraordinary man, and no one seems gives a shit. Granted, I wanted stories of them during the war, but The Denis Judd one is good so far (he's just married and they're so in love, I cried that Elizabeth placed her wedding bouquet on the Unknown Soldier grave). The Reluctant King: The Life and Reign of George VI, 1895-1952, it's probably the other book you found?

But there's also "George VI" by her too, and I legitimately can't tell if one is just a redesigned, updated version (it also has a big "KING'S SPEECH" advertising bubble).

---

The Reluctant King by Sarah Bradford-1990

Description[s] from Amazon:

'The Reluctant King' is the first major biography of George VI in over thirty years. It is an intimate portrait of the man and his entire family. The abdication crisis, the King's leadership during the war, his relationship with Churchill and much more are examined in detail by this revealing biography.

George VI *-also by Sarah Bradford *-2011"

Description:

The definitive biography of George VI, the hero of The King's Speech George VI reigned through taxing times. Acceding to the throne upon his brother's abdication, he was immediately confronted with the turmoil in European politics leading up to the Second World War, then the War itself, followed by a period of austerity, social transformation and loss of Empire. George was unprepared for kingship, suffering from a stammer which could make public occasions very painful for him. Moreover he had grown up in the shadow of his brother, a man who had been idolized as no royal prince has been, before or since. However, as Sarah Bradford shows in this sympathetic biography, although George was not born to be king, he died a great one. 'A triumph ... Sarah Bradford looks set to inherit Lady Longford's mantle as royal biographer supreme' Mail on Sunday 'Lucid, convincing and admirably fair ... George VI has been fortunate in his biographer' Philip Ziegler 'Vivid, thorough and enjoyable' Independent Sarah Bradford is a historian and biographer. Her books include Cesare Borgia (1976), Disraeli (1982), winner of the New York Times Book of the Year, Princess Grace (1984), Sacherevell Sitwell (1993), Elizabeth: A Biography of Her Majesty the Queen (1996), America's Queen: The Life of Jacqueline Kennedy Onassis (2000), Lucrezia Borgia (2005) and Diana (2007).She lives in London and is married to the 8th Viscount Bangor. She is currently working on a full scale biography of Queen Victoria.'

---

In hopes of probable considerable mentions I've also purchased:

Young Elizabeth: The Making of the Queen by Kate Williams

Description:

"A lively and poignant biography of the young princess who, at the impressionable age of eleven, found that she was now heiress to the throne, by the New York Times bestselling author of Becoming Queen Victoria.

We can hardly imagine a Britain without Elizabeth II on the throne. It seems to be the job she was born for. And yet for much of her early life the young princess did not know the role that her future would hold. She was our accidental Queen.

Elizabeth's determination to share in the struggles of her people marked her out from a young age. Her father initially refused to let her volunteer as a nurse during the Blitz, but relented when she was 18 and allowed her to work as a mechanic and truck driver for the Women's Auxiliary Territorial Service. It was her forward-thinking approach that ensured that her coronation was televised, against the advice of politicians at the time.

Kate Williams reveals how the 25-year-old young queen carved out a lasting role for herself amid the changes of the 20th century. Her monarchy would be a very different one to that of her parents and grandparents, and its continuing popularity in the 21st century owes much to the intelligence and elusive personality of this remarkable woman."

Never Surrender: Winston Churchill and Britain's Decision to Fight Nazi Germany in the Fateful Summer of 1940 by John Kelly

Description:

"WWII scholar John Kelly triumphs again” (Vanity Fair) in this remarkably vivid account of a key moment in Western history: The critical six months in 1940 when Winston Churchill debated whether England should fight Nazi Germany—and then decided to “never surrender.”

London in April, 1940, is a place of great fear and conflict. The Germans have taken Poland, France, Holland, Belgium, and Czechoslovakia. The Nazi war machine now menaces Britain, even as America remains uncommitted to providing military aid. Should Britain negotiate with Germany? The members of the War Cabinet bicker, yell, and are divided. Churchill, leading the faction to fight, and Lord Halifax, cautioning that prudence is the way to survive, attempt to usurp one another by any means possible. In Never Surrender, we feel we are alongside these complex and imperfect men, determining the fate of the British Empire, and perhaps, the world.

Drawing on the War Cabinet papers, other government documents, private diaries, newspaper accounts, and memoirs, historian John Kelly tells the story of the summer of 1940. Kelly takes readers from the battlefield to Parliament, to the government ministries, to the British high command, to the desperate Anglo-French conference in Paris and London, to the American embassy in London, and to life with the ordinary Britons. We see Churchill seize the historical moment and ultimately inspire his government, military, and people to fight. Kelly brings to life one of the most heroic moments of the twentieth century and intimately portrays some of its largest players—Churchill, Lord Halifax, Hitler, FDR, Joe Kennedy, and others. Never Surrender is a fabulous, grand narrative of a crucial period in World War II and the men and women who shaped it. "For lovers of minute-by-minute history, it’s a feast"

This one gives me a decent amount of hope, because he and King George VI developed "the closest personal relationship in modern British history between a monarch and a Prime Minister." Every Tuesday for four and a half years from September 1940, the two men met privately for lunch to discuss the war in secret and with frankness. And Lord knows, there are a lot of Churchill books.

---

In general, I'm collecting books that will surely mention him. Queen Elizabeth I (? right? I'm still struggling with their family tree and birth names, vs nicknames vs regnal) - Albert's wife was lovely as well and there's a book on her - their is problem, in regard to stories of Bertie in a bio of his wife, being that she lived 63 years after he died. When the Royal family were in Buckingham Palace. The whole family also refused to flee to Canada to stay safe.Throughout the war, after air raids, the King and Queen would visit the scene of devastation (Churchill also) and offer consolation to those who had lost their homes. It was only after Buckingham Palace was bombed, however, that the Queen felt she could really relate to the people of London. "I’m glad we’ve been bombed. It makes me feel I can look the East End in the face," she famously said. (which is obviously coming from a very privileged person, but she was relating herself to the poorest of the poor).

The Queen Mother by William Shawcross

Description:

The official and definitive biography of Queen Elizabeth the Queen Mother, the most beloved British monarch of the twentieth century. Consort of King George VI, mother of Queen Elizabeth II, and grandmother of Prince Charles, Elizabeth Angela Marguerite Bowes-Lyon—the ninth of the Earl of Strathmore’s ten children—was born on August 4, 1900, and, certainly, no one could have imagined that her long life (she died in 2002) would come to reflect a changing nation over the course of an entire century. Vividly detailed, written with unrestricted access to her personal papers, letters, and diaries, this candid royal biography by William Shawcross is also a singular history of Britain in the twentieth century

P.S. It is pretty funny asking clerks for books on him - I went into an independent bookstore with two 20-something guys at the counter and I walked right up to them and it was just so funny, their reaction to me asking "I was wondering if you have book about King George the Sixth" one responded, "...well...let's find out...?...!")

P.P.S. there's that show on Netflix "The Crown" - the first two episodes focuses a lot on him.