I had never properly been to Saltaire before and what a splendid surprise it was to me. Saltaire, in case you don't know about it, is a model factory community built by Titus Salt between 1851 and 1876. It is a little difficult to know what to make of old Titus. On the one hand he was one of that unattractive breed of teetotalling, selfrighteous, Godfearing industrialists in which the nineteenth century seemed to specialize a man who didn't want merely to employ his workers but to own them. Workers at his mill were expected to live in his houses, worship in his church, follow his precepts to the letter. He would not allow a pub in the village and so saddled the local park with stern restrictions regarding noise, smoking, the playing of games and other indecorous activities that there was not much fun to be had in it. Workers were allowed to take boats out on the river but only, for some reason, so long as there were never more than four out at any one time. Whether they Uked it or not, in short, they were compelled to be sober, industrious and quiet.

 On the other hand, Salt showed a rare degree of enlightenment in terms of social welfare, and there is no question that his employees enjoyed cleaner, healthier, more comfortable living conditions than almost any other industrial workers in the world at that time.

 Though it has since been swallowed up by the great sprawl that is the LeedsBradford conurbation, when it was built Saltaire stood in clean, open countryside a vast change from the unhealthy stew of central Bradford, where in the 1850s there were more brothels than churches and not a single yard of covered sewers. From bleak and grimy backtobacks, Salt's workers came to airy, spacious cottages, each with a yard, private gas supply and at least two bedrooms. It must have seemed a very Eden.

 On a sloping site overlooking the River Aire and Leeds to Liverpool Canal, Salt built a massive mill known as the Palace of Industry in its day the largest factory in Europe spreading over nine acres and graced with a striking Italianate campanile modelled on that of Santa Maria Gloriosa in Venice. He additionally built a park, a church, an institute for 'conversation, refreshment and education', a hospital, a school and 850 trim and tidy stone houses on a formal grid of cobbled streets, most of them named for Salt's wife and eleven children. The institute was perhaps the most remarkable of these undertakings. Built in the hope of distracting workers from the peril of drink, it contained a gymnasium, a laboratory, a billiards room, a library, a reading room, and a lecture and concert hall. Never before had manual workers been given a more lavish opportunity to better themselves, an opportunity that many scores enthusiastically seized. One James Waddington, an untutored woolsorter, became a world authority on linguistics and a leading light of the Phonetic Society of Great Britain and Ireland.

 Today Saltaire remains miraculously intact, though the factory has long since ceased to manufacture cloth and the houses are now privately owned. One floor of the factory contains a wonderful and free permanent exhibition of the works of David Hockney, and the rest is given over to retail space selling the most extraordinary range of designer clothes, posh and stylish housewares, books and arty postcards. It was a kind of miracle to find this place this yuppie heaven inhabiting a forgotten corner of metropolitan Bradford. And yet it seemed to be doing very well. David Cook and I had an unhurried look around the gallery I had never paid much attention to Hockney, but I'll tell you this: the boy can draw then wandered through the streets of former workers' cottages, all of them snug and trim and lovingly preserved, before striking off through Roberts Park to Shipley Glen, a steep wooded dell leading to a sweep of open common land of the sort where you can usually find people exercising their dogs. It looks as if it has been wild and untended for ever, but in fact a century ago this was the site of a hugely successful amusement park one of the world's first.

 Among the many attractions were an aerial gondola ride, a big dipper and what was billed as The Largest, Wildest, Steepest Toboggan Slide Ever Erected on Earth'. I've seen pictures of these, filled with ladies with parasols and mustachioed men in stiff collars, and they do actually look pretty exciting, particularly the toboggan ride, which ran for perhaps a quarter of a mile down a formidably steep and perilous hill. One day in 1900, as a earful of smartly dressed tobogganers were being hauled up the hill to be despatched on another hairraising descent, the winch cable snapped, sending the passengers hurtling out of control to a messy but exciting death at the bottom, and that was pretty much the end of the Shipley Glen Amusement Park. Today all that's left of these original thrills is the poky Glen Tramway, which goes up and down a nearby slope in a discreet and sedate fashion, as it has since 1895, but among the tall grass we did find a remnant of old track from the original toboggan ride, which thrilled us mildly.

 The whole of this area is a kind of archaeological site of the nottoodistant past. A mile or so away, up an overgrown track, is the site of Milner Field, an ornate palace of stone built by Titus Salt Junior in 1870 at a time when the Salt family fortunes seemed boundless and perpetually secure. But weren't they in for a surprise? In 1893, the textile trade went into a sudden slump, leaving the Salts dangerously overextended, and the family abruptly lost control of the firm. In consternation and shame, they had to sell the house, mill and associated holdings. Then began a strange and sinister series of events. Without apparent exception all the subsequent owners of Milner Field suffered odd and devastating setbacks. One whacked himself in the foot with a golf club and died when the wound turned gangrenous. Another came home to find his young bride engaged in an unseemly bout of naked bedtop wrestling rwith a business associate. He shot the associate or possibly both of them accounts vary but in any case he certainly made a mess of the bedroom and was taken off to have his neck stretched.

 Before long the house developed a reputation as a place where you could reliably expect to come a cropper. People moved in and abruptly moved out again, with ashen faces and terrible wounds. By 1930, when the house went on the market one last time, no buyer could be found for it. It stayed empty for twenty years, and finally in 1950 it was pulled down. Now the site is overgrown and weedy, and you could walk past it without ever guessing that one of the finest houses in the North had once stood here. But if you poke about in the tall grass, as we did now, you can find one of the old conservatory floors, made of neatly patterned black and white tiles. It was strangely reminiscent of the Roman mosaic I had seen at Winchcombe, and scarcely less astonishing.

 It seemed remarkable to think that a century ago Titus Salt Junior could have stood on this spot, in a splendid house, looking down the Aire Valley to the distant but formidable Salt's Mill, clanging away and filling the air with steamy smoke, and beyond it the sprawl of the richest centre of woollen trade in the world, and that now it could all be gone. What would old Titus Senior think, I wondered, if you brought him back and showed him that the family fortune was spent and his busy factory was now full of stylish chrome housewares and wooftah paintings of naked male swimmers with glistening buttocks?

 We stood for a long time on this lonely summit. You can see for miles across Airedale from up there, with its crowded towns and houses climbing up the steep hillsides to the bleak upland fells, and I found myself wondering, as I often do when I stand on a northern hillside, what all those people in all those houses do. There used to be scores of mills all up and down Airedale ten or more in Bingley alone and now they are virtually all gone, torn down to make room for supermarkets or converted into heritage centres, blocks of flats or shopping complexes. French's Mill, Bingley's last surviving textile factory, had closed a year or two before and now sat forlorn with broken windows.One of the great surprises to me upon moving North was discovering the extent to which it felt like another country. Partly it was from the look and feel of the North the high, open moors and big skies, the wandering drystone walls, the grimy mill towns, the snug stone villages of the Dales and Lakes and partly, of course, it was to do with the accents, the different words, the refreshing if sometimes startling frankness of speech. Partly it was also to do with the way Southerners and Northerners were so extraordinarily, sometimes defiantly, ignorant of the geography of the other end of the country. It used to astonish me, working on newspapers in London, how often you could call out a question like 'Which of the Yorkshires is Halifax in?' and be met with a tableful of blank frowns. And when I moved North and told people that I'd previously lived in Surrey near Windsor, I often got the same look a kind of nervous uncertainty, as if they were afraid I was going to say, 'Now you show me on the map just where that is.'