LONDON (Reuters) – JPMorgan’s consumer bank Chase in Britain has attracted more than half a million customers since launching eight months ago, in the most detailed snapshot given by the Wall Street giant to date on how the digital venture is progressing. Chase has also amassed 10 billion dollars’ worth of customer deposits in Britain and has processed 20 million payments, Sanoke Viswanathan, chief executive of JPMorgan’s international consumer business, told the bank’s investor day on Monday. JPMorgan is using Britain as a test bed for rolling out digital consumer banking services overseas, a…