By the time Hill came on the scene, however, the landscape had been transformed: the line between poetry and prose had been blurred, the laws of prosody had been suspended and poets were marginalised by or subsumed into other art forms, such as popular music. Poems too became primarily vehicles of self-expression. Like everybody else, poets had to compete for attention and celebrity. As schools no longer taught their pupils poetry by heart, the handful of verses that retained public affection acquired the status of secular icons. New poetry seldom achieves such recognition, for the very good reason that is rarely memorised or indeed memorable. Poets instead strove to reinvent their functions: as performance art for highbrows, icing on the secular wedding cake, or therapy for the deserted, the desolated and the dumped. Occasionally a work combines all these functions: Ted Hughes's collection Birthday Letters, for instance, acquired canonical status overnight, rendering it above criticism — not on account of its quality, which was uneven, but of its subject-matter. The appeal to sentimentality of this epilogue to the Hughes/Plath relationship trumped all other considerations.

Geoffrey Hill will have none of it. In his March Oxford lecture, he scandalises the audience by questioning the most revered of the war poets: "To say that [Wilfred] Owen wrote two of the great poems of the 20th century, in ‘Sensibility' and ‘Spring Offensive', but that some of his poetry, even some of the most loved, is a bit sloppy . . . well, if one had a career to lose it would lose one one's career, I suppose." If language is, as he believes, the last repository of meaning, "it is essential to apply the most rigorous technical demands to these sanctified objects of public worship."

This leads Hill to the gravamen of his charge against much of the poetry of today: "It is public knowledge that the newest generation of poets is encouraged to think of poems as Facebook or Twitter texts — or now, I suppose, much more recently, as selfies." The mention of such an improbable neologism from such a source elicited an embarrassed titter from the audience, as if Hill had caught his academic peers indulging a secret vice. "The poem as selfie is the aesthetic criterion of contemporary verse," he continued. "And, as you know, in my malign way I want to put myself in opposition to this view. That is to say, the poem should not be a spasmodic issue from the adolescent or even the octogenarian psyche, requiring no further form or validation." Hill came back to the theme in his vindication of Hopkins, whose sonnets did not, he expostulated, deserve the condescension of posterity: "I do not think that they are Hopkins's selfies."

The underlying reason for Hill's rejection of poetry as pure self-expression is that he sees such narcissism as beneath the dignity of his calling. He preaches, rather, what he has practised ever since his youth: a poetry of ideas. It is this determination to place ideas at the heart of his work that sets him apart from even his most celebrated contemporaries. Disputing Auden's claim that "art is a product of history, not a cause", he argues that the true poem is "alienated from its existence as historical event". To capture the realm in which it exists over and above history, he proposes the notion of "alienated majesty", the invisible repository of ideas, values and faith. "Alienated majesty signifies a reality, however, even if not an actuality."

Hill's life has followed a trajectory that was commoner in his time than in later generations. Born in Bromsgrove, Worcestershire, he was the son of a police constable. Grammar school nurtured a love of literature that blossomed at Oxford into a firm resolution to live the intellectual life. From the first, Hill's poetry has been the most important but by no means the only manifestation of a voracious appetite for ideas. Indeed, for the first five decades, his poetic output was interrupted by long periods of sterility and despair. The first Collected Poems of 1985 was less than a fifth of the length of Broken Hierarchies; it was followed by another decade of silence.