12 Years a Slave tells an American story; but when will Britain confront its own history of slavery? Critics seem shaken and overwhelmed by its unsparing detail and authenticity. Glittering prizes will, for sure, follow. McQueen, known as "an English film-maker" is a Londoner of Grenadian descent: "I'm here because my family went through slavery. Fact. That fact and others have been buried away in unknown graves in the country which now claims him and in the other UK nations too. Our national narrative goes like this: slavery occurred in America and the untamed Caribbean isles, with the co-operation of the "dark continent" and it took heroic Britons to end the evil. Lies told so often and so assiduously eventually transmute into impenetrable, solid veracities. This film will not shift those steadfast beliefs because the story is well, again, an American one. When will we get such a film made about, say, one of the small boys sold in a London coffee house, his life as a slave on these shores, his attempts to escape, the terrible punishments, mutilations and degradation? It happened, even after Lord Mansfield decreed in 1772, that no men or women could be sent forth from these isles to be slaves. Oh the arguments I have had with people, including friends, about Britain's slave history. They do not want to know. Last summer we went on holiday to Trinidad and Tobago. In museums, seeing shackles, testimonies, torture instruments, etchings of whippings and hangings, my daughter wept. Although she has been educated in Britain, she was never taught about what really went on, the grotesque truths. To calm those readers who will be getting very angry, I must acknowledge some facts, which do, up to a point, mitigate the culpability of this nation. Arabs and Africans had been enslavers for many centuries and continued after abolition. Long before the British came into the business, the Spanish, Dutch, French and Portuguese were catching and transporting Africans across the Atlantic and selling them. Britain then transformed the trade into a massive, profitable industry. The country, however, had vocal women and men of conscience who, with ex-slaves, finally stopped the commodification of humans. It was a moral crusade. Ships patrolled the coasts of Africa to stop slave ships. It is right that we always remember what they did. But we must also remember the horrors of enslavement that created revulsion among those great and good, women and Quakers in particular. Sir John Hawkins, second cousin of Sir Francis Drake, started it all in 1555, with a cargo of 301 slaves. After the Restoration, the trade was controlled by monopoly companies backed by the King. Jamaica was seized by the British in 1655. Fifty years later, there were 42,000 slaves there. Half a century after that the number rose to 200,000. Death rates were high so many more must have landed. Read the books by James Walvin to get the stark details. Almost every institution and class in this country profited. The Tate Gallery, Oxbridge colleges, the Church, politicians, the aristocracy, middle classes, banks, manufacturers and traders. In the recent past, to their credit, cities like Bristol and Liverpool have broken the silence and found ways to permanently remember the stolen people. It's not enough but at least England tries. Scotland, in contrast, has completely excised its part and the whitewash continues. It joined the Union so it could get into the lucrative game. Glasgow was built on slave money and later the empire. Many great lairds, such as Richard Oswald of Auchincruive House in Ayrshire, owned massive Caribbean slave plantations. Robert Burns planned to go out to the Caribbean to become a slave driver. The vast number of Scottish surnames of black people in the US, Caribbean and UK show just how deeply involved the Scots were in this enterprise. Someone please ask Alex Salmond if this will be in the school curriculum of an independent Scotland. African-American writers and artists will not let their nation forget. Here the descendants of slaves remain reticent. Some even feel shame and don't want to be reminded of those dark centuries. Though we have compelling black writers, thus far none has given us the potent slave narratives of, say, Alex Haley or Toni Morrison. McQueen sees the consequences of the trade in black-skinned men, women and children: "Look at the prison population, mental health issues, poverty." Actual enslavement still goes on too - trafficked farm workers, young, forced prostitutes, undocumented domestics and cleaners. This groundbreaking film, whilst very important, will not get audiences to make connections between America and Britain, then and now. And so British slavery remains the greatest story never told.