Summary: <i>Pressure is mounting on the archaic technology systems that underpin some of the largest banks as they roll out online and mobile services to compete in the digital age. High street lenders are spending more on 'digitising' services, from renovating branches with new cash machines and iPads, to launching mobile applications and digital payments.</i><p>The article is soft paywalled. To read it, Google the title, if ft.com still won't show you the article, try a different browser or incognito/private mode