You can scan the barcode from the phone, either from the pdf or by storing the barcode in an app like Stocard. Can be very handy if you leave your ticket (or campaign card) at home or forgot to print it out.
I received that email at 17:01. I might have enquired (not sure), but can't remember purchasing. Nothing new in the email to be honest as it simply directs you to an existing link.
Anyway, I've forwarded it to someone who may use the facility.