Seamus Heaney, of course, ploughed the same furrow, but more soberly, and always with a moral at the end of the field. In “Fern Hill”, Thomas left his younger self in a state of tragic innocence: “Time held me green and dying / Though I sang in my chains like the sea” – an unexpected and almost inexplicable closing image. Heaney’s final metaphors came with the meaning conveniently clarified: the blackberries of boyhood went off; the poet’s pen dug up meaning like a spade; his frail old father reminded him of a child.

Now more than 40 years old, these poems are still on the GCSE syllabus as touchstones of best practice in contemporary poetry. Heaney’s evocative economies of language have earned the appreciation of readers. But as a model of poetic writing the weakest point of these early works – the patness of the meaning – has been artificially prized by a system that tests literal rather than lateral thinking.

The more recent beneficiaries of this situation have been Simon Armitage and Carol Ann Duffy. Both, again, poets whose ears are worth listening to. But in the school anthologies they tend to be represented by poems that offer a neat personal story for dissection. This template also informs the selection of poems from “Different Cultures” . Cultures can be considered different if the people they feature are poorer and more exotic than the average British schoolchild: “Island Man”, “Two Scavengers in a Truck, Two Beautiful People in a Mercedes”, “Night of the Scorpion”, “Presents from my Aunts in Pakistan”.

Segregation by identity inevitably favours poems cast in the form of relatively stable monologues. The idea that poetic language might be a way of imagining modes of being and emotions that won’t sit still has to wait outside until playtime. Then it returns in the form of popular music, the lyrical abstraction of which would look worryingly avant-garde in an exam board anthology. Even a radio-friendly couplet such as Coldplay’s “Lights will guide you home / And ignite your bones” fuses sound, feeling and sense more interestingly than the simple onomatopoeic “squelch and slap” of Heaney’s spadework.

Yet the rationalised critical model now runs right through the system, from schools to university and on to publishing and arts funding. Contemporary poetry is praised and approved, but rarely loved as much as the other arts. The American poet Frank O’Hara saw what was happening 50 years ago: “Too many poets act like a middle-aged mother trying to get her kids to eat too much cooked meat, and potatoes with dripping (tears) .” Wisely, he took the children’s side: “If they don’t need poetry bully for them. I like the movies too.”

But music and movies are no substitute for what poetry can do as an art, and that is to display the life of language with wit and intensity. Barack Obama – who promises to be more attuned to the life of language than his predecessor – chose to have the poet Elizabeth Alexander read at his inauguration. Her definition of poetry identifies the characteristic curiosity of versified words about their own power: “Poetry (here I hear myself loudest) / is the human voice, / and are we not of interest to each other?”

Unfortunately, reforming the poetic culture of Great Britain is not on Team Obama’s to-do list. But there are plenty of poems out there that would fruitfully complicate the current GCSE anthologies, and possibly even enthuse turned-off students. The late Mick Imlah’s The Lost Leader(2008), for instance, takes the Heaney-esque story about the child-poet into darker territory with “Railway Children”. Daljit Nagra, himself a secondary school teacher, included a clever satire on the “Different Cultures” section in his 2007 debut, Look We Have Coming to Dover!(“My boy, vil he tink ebry new / Barrett-home muslim hav goat blood-party / barbeque?”) And Alice Oswald’s Dart, which won the TS Eliot Prize in 2005, presents real modern voices mingling in an evocation of the Devon landscape.

All these poets, however, still work within the frame – albeit towards the edges – of the stable monologue, where words flesh out the fiction of an overheard speaker. Working beyond that frame there are poets who, like Dylan Thomas, let language run away from the everyday into unexpected meanings. Of the younger generation, Keston Sutherland’s poetry especially impresses as a passionate and satirical incantation of English now (“Some cops boo. Evidently run about pin / airbag down make a ripped off picket / stunned. If you want to change the / tick alright”).

One of the classics of early 21st-century English poetry, however, is the work of RF Langley, a retired Suffolk schoolteacher, whose Collected Poems were shortlisted for the Whitbread (now Costa) Prize in 2000. He has published a fine follow-up, The Face of It (2007). Langley’s meditations on the natural world make English strange with Shakespearean animation, jumping from rhyme to rhyme and thought to thought. As TS Eliot also said, “there is a logic of the imagination as well as a logic of concepts” – and it can follow patterns as involved as 50 swifts on a summer evening.

from Tom Thumb

We should accept the obvious facts of physics.

The world is made entirely of particles in

fields of force. Of course. Tell it to Jack. Except it

doesn’t seem to be enough tonight. Not because

he’s had his supper and the upper regions are

cerulean, as they have been each evening

since the rain. Nor just because it’s nine pm and

this is when, each evening since we came, the fifty

swifts, as passionately excited as any

particles in a forcefield, are about to end

their vesper flight by escalating with thin shrieks

to such a height that my poor sight won’t see them go.

Though I imagine instantly what it might be

to separate and, sleeping, drift so far beyond

discovery that any flicker which is left

signs with a scribble underneath the galaxy.

RF Langley

‘Tom Thumb’ appears in R?F Langley’s ‘Collected Poems’, published by Carcanet at £6.95

Railway Children

After the branch line went to Ochiltree –

I would have been fifteen – two men were shut

In the station waiting-room, and one of them

Brought out his pocket anecdote of me:

“The boy’s a splurger! – hey, when Danny Craig

Passed him a flask on the train the other day,

He gulped it, just for the sake of showing off.

And he’s a coward too, for all his face.

For after he’d taken the drink, he noised about,

And Dan, to clip his wings, made up a threat

To hang him out o’ the window by his heels –

You know Dan didn’t mean it, but the boy

Grew white at the very idea o’t – shook

Like a dog in the wet – ‘Oh!,’ he cried, and ‘Oh! –

But how would tha ground go flying past your eyes;

How quick tha wheel beside your face would buzz –

Would blind you by quickness – how tha grey slag

Would flash below ye!’ – Those were his actual words;

He seemed to see it all as if for real,

And flinched, and stopped, and stared, like a body in fits,

Till Dan was drawn to give him another drink;

‘You’d spew with dizziness,’ he said, shut

His eyes where he sat, and actually bocked himself.”

Mick Imlah

‘Railway Children’ is taken from ‘The Lost Leader’, published by Faber & Faber at £9.99