"A letter lost in the post could be the difference between life and death"
Indeed, Mr Hancock. But have you never experienced the problems of e-mail communication, which opens up possibilities for a whole lot more ways for communications to be lost, mis-directed, spied on etc.?
Reliable and (reasonably) confidential delivery of information via e-mail requires NHS staff and their clients to be totally clued-in on best-practice. I just can't see that happening for quite a few years, if ever.
By all means have e-mail communication as an opt-in service, but for the sake of those who can't grasp the technology well-enough, keep the old methods as well.