By Huw Jones LONDON (Reuters) – Britain’s banks and building societies should make sure customers can still access cash before closing a branch as more financial services move online, the country’s markets regulator proposed on Thursday. The Financial Conduct Authority (FCA) said it was using powers under a new financial services law approved earlier this year to require banks, such as Barclays, Lloyds, HSBC and NatWest to undertake “cash access assessments” when they are considering closing a branch. Britain is also likely to issue a digital version of the pound in the second half of the deca…