The NHS suffers from the common organisational delusion that email is horrendously insecure, while fax, telephone calls[1] and postal letters are somehow not.
This trickles down to policies and systems. Front line staff use email internally all the time, but aren't allowed to use it with patients unless they have super special permission. And even then, they're not allowed to say anything clinical.
[1] There's a related phenomenon where they withold CID and repeatedly call the phone you can't hear on, rather the one you can. As if an 07 number magically imparts powers of confidentiality, like the cubicle curtains in Casualty.