Priestley was born on 13 September 1894 at 34 Mannheim Road, Manningham, which he described as an “extremely respectable” suburb of Bradford. His father Jonathan Priestley (1868–1924) was a headmaster. His mother Emma (nee Holt) (1865–1896) died when he was just two years old, and his father remarried four years later. Priestley was educated at Belle Vue Grammar School, which he left at sixteen to work as a junior clerk at Helm & Co., a wool firm in the Swan Arcade. During his years at Helm & Co. (1910–1914), he started writing at night and had articles published in local and London newspapers. He was to draw on memories of Bradford in many of the works he wrote after he had moved south, including Bright Day and When We Are Married. As an old man, he deplored the destruction by developers of Victorian buildings in Bradford such as the Swan Arcade, where he had his first job.

Priestley served in the British army during the First World War, volunteering to join the 10th Battalion, the Duke of Wellington’s Regiment on 7 September 1914, and being posted to France as a Lance-Corporal on 26 August 1915. He was badly wounded in June 1916, when he was buried alive by a trench mortar. He spent many months in military hospitals and convalescent establishments, and on 26 January 1918 was commissioned as an officer in the Devonshire Regiment and posted back to France late summer 1918. As he describes in his literary reminiscences, Margin Released, he suffered from the effects of poison gas, and then supervised German prisoners of war, before being demobilised in early 1919.

In 1921 Priestley married Emily “Pat” Tempest, a music-loving Bradford librarian. Two daughters were born, Barbara (later known as the architect Barbara Wykeham) in 1923 and Sylvia (a designer known as Sylvia Goaman following her marriage to Michael Goaman) in 1924, but in 1925 his wife died of cancer.

In September 1926, Priestley married Jane Wyndham-Lewis (ex-wife of the one-time ‘Beachcomber’ columnist D. B. Wyndham-Lewis, no relation to the artist Wyndham Lewis); they had two daughters (including music therapist Mary Priestley, conceived while Jane was still married to D. B. Wyndham-Lewis) and one son. During the Second World War, Jane ran several residential nurseries for evacuated mothers and their children, many of whom had come from poor districts.

In 1934 he published the travelogue English Journey, an account of what he saw and heard while travelling through the country in the depths of the Great Depression.

In 1940, Priestley wrote an essay for Horizon magazine, where he criticised George Bernard Shaw for his support of Stalin: “Shaw presumes that his friend Stalin has everything under control. Well, Stalin may have made special arrangements to see that Shaw comes to no harm, but the rest of us in Western Europe do not feel quite so sure of our fate, especially those of us who do not share Shaw’s curious admiration for dictators.”

During the Second World War, he was a regular broadcaster on the BBC. The Postscript, broadcast on Sunday night through 1940 and again in 1941, drew peak audiences of 16 million; only Churchill was more popular with listeners. Graham Greene wrote that Priestley “became in the months after Dunkirk a leader second only in importance to Mr. Churchill. And he gave us what our other leaders have always failed to give us – an ideology.” But his talks were cancelled. It was thought that this was the effect of complaints from Churchill that they were too left-wing; however, in 2015 Priestley’s son said in a talk on the latest book being published about his father’s life that it was in fact Churchill’s Cabinet that brought about the cancellation by supplying negative reports on the broadcasts to Churchill.

In 1941 he played an important part in organising and supporting a fund-raising campaign on behalf of the London Philharmonic Orchestra, which was struggling to establish itself as a self-governing body after the withdrawal of Sir Thomas Beecham. In 1949 the opera The Olympians by Arthur Bliss, to a libretto by Priestley, was premiered.

Priestley chaired the 1941 Committee, and in 1942 he was a co-founder of the socialist Common Wealth Party. The political content of his broadcasts and his hopes of a new and different Britain after the war influenced the politics of the period and helped the Labour Party gain its landslide victory in the 1945 general election. Priestley himself, however, was distrustful of the state and dogma, though he did stand for the Cambridge University constituency in 1945.

Priestley’s name was on Orwell’s list, a list of people which George Orwell prepared in March 1949 for the Information Research Department (IRD), a propaganda unit set up at the Foreign Office by the Labour government. Orwell considered or suspected these people to have pro-communist leanings and therefore to be unsuitable to write for the IRD.

In 1953, Priestley divorced his second wife then married the archaeologist and writer Jacquetta Hawkes, with whom he collaborated on the play Dragon’s Mouth. The couple lived at Alveston, Warwickshire, near Stratford-upon-Avon later in his life.

He was a founding member of the Campaign for Nuclear Disarmament in 1958.

In 1960, Priestley published Literature and Western Man, a 500-page survey of Western literature in all its genres from the second half of the 15th century to the present (the last author discussed is Thomas Wolfe).

Priestley began placing his papers at the Harry Ransom Center at the University of Texas at Austin in 1960, with additions being made throughout his lifetime. The Center has continued to add to the collection through gifts and purchases when possible. The collection currently amounts to roughly 23 boxes, and includes original manuscripts for many of his works and an extensive series of correspondence.

His interest in the problem of time led him to publish an extended essay in 1964 under the title of Man and Time (Aldus published this as a companion to Carl Jung’s Man and His Symbols). In this book he explored in depth various theories and beliefs about time as well as his own research and unique conclusions, including an analysis of the phenomenon of precognitive dreaming, based in part on a broad sampling of experiences gathered from the British public, who responded enthusiastically to a televised appeal he made while being interviewed in 1963 on the BBC programme, Monitor.

Priestley snubbed the chance to become a life peer in 1965 and also declined appointment as a Companion of Honour in 1969. But he did become a member of the Order of Merit in 1977. He also served as a British delegate to UNESCO conferences.

The University of Bradford awarded Priestley the title of honorary Doctor of Letters in 1970, and he was awarded the Freedom of the City of Bradford in 1973. His connections with the city were also marked by the naming of the J. B. Priestley Library at the University of Bradford, which he officially opened in 1975, and by the larger-than-life statue of him, commissioned by the Bradford City Council after his death, and which now stands in front of the National Media Museum.

Priestley was married five times. Priestley also had a number of affairs, including a serious relationship with the actress Peggy Ashcroft. Writing in 1972, Priestley described himself as ‘lusty’ and as one who has ‘enjoyed the physical relations with the sexes … without the feelings of guilt which seems to disturb some of my distinguished colleagues’.