The London borough of Kensington and Chelsea has become the first area in the UK to break through the £100,000 ($200,000) barrier for average household income, according to the latest wealth survey by Barclays Premier Banking. The average household earnings in the borough are now £101,600, an increase of seven per cent over the last year and over £20,000 higher than its nearest challengers, the Cities of London and Westminster (£81,425) followed by Hampstead and Highgate (£77,500). Beaconsfield, near London, is the wealthiest place outside the capital with an average household income of £74,345; the wealthiest place outside England's south-east is Tatton in Cheshire, with an average income of £62,350. The fastest-growing wealthy area in the country is the Cotswolds; household incomes there increased by nine per cent over the last year to an average of £60,800. Bret Packard, managing director of Barclays Premier Banking, said: "High incomes are no longer unusual in the UK. There are now one million individuals in the UK earning over £100,000 a year."