transformed Peterborough from a market town to an industrial centre. Lord Exeter had opposed the railway passing through Stamford, so Peterborough, situated between two main terminals at London and Doncaster, increasingly developed as a regional hub. Coupled with vast local clay deposits, the railway enabled large-scale brick-making and distribution to take place. The area was the UK's leading producer of bricks for much of the twentieth century. Brick-making had been a small seasonal craft since the early nineteenth century, but during the 1890s successful experiments at Fletton using the harder clays from a lower level had resulted in a much more efficient process. The market dominance during this period of the London Brick Company, founded by the prolific Scottish builder and architect John Cathles Hill, gave rise to some of the country's most well-known landmarks, all built using the ubiquitous Fletton Brick. Perkins Engines was established in Peterborough in 1932 by Frank Perkins, creator of the Perkins diesel engine. Thirty years later it employed more than a tenth of the population of Peterborough, mainly at Eastfield. Baker Perkins had relocated from London to Westwood, now the site of HM Prison Peterborough, in 1903, followed by Peter Brotherhood to Walton in 1906; both manufacturers of industrial machinery, they too became major employers in the city. British Sugar has moved its headquarters to Hampton from Woodston, the beet sugar factory, which opened there in 1926, was closed in 1991. The Norwich and Peterborough (N&P) was formed by the merger of the Norwich Building Society and the Peterborough Building Society in 1986. It was the ninth largest building society at the time of its merger into the Yorkshire Group in 2011. N&P continued to operate under its own brand administered at Lynch Wood until 2018. Prior to merger with the Midlands Co-op in 2013, Anglia Regional, the UK's fifth largest co-operative society, was also based in Peterborough, where it was established in 1876. The combined society began trading as Central England Co-operative in 2014. Designated a New Town in 1967, Peterborough Development Corporation was formed in partnership with the city and county councils to house London's overspill population in new townships sited around the existing urban area. There were to be four townships, one each at Bretton (originally to be called Milton, a hamlet in the Middle Ages), Orton, Paston/ Werrington and Castor. The last of these was never built, but a fourth,