Jobsworths say no
To implement an end-to-end, integrated government IT set up here in Blighty would take a major shift in Civil Service culture and outlook, which is unlikely to happen anytime soon. Most online government services that I have personally used seem to be a digitization of existing system systems and practices, with no apparent sideways integration with other departments and services. To get to a true cross government IT platform will probably require a major re-organisation of how the Civil service and government departments work and relate to each other. At the end of the day, widespread computerization in central and local government is going to cost many white-collar workers their job and dismantle many an empire that has taken many decades of careful construction to build up. Given the prevalence of Sir Humphrey types that form the upper echelons, I can't see that there is going to be any great appetite for radical re-organisation that is likely to be needed.