In reply to:
(cough cough) I don't recall be informed to leave the faceplate behind.
I assumed something because that is what happened on the one occasion I had an engineer installation. (At that time there wasn't a choice, at least with my then ISP).
Re: Krohn/Krone, I wondered if this was a peculiarity of Solwise who spell it Krohn. They do not appear to be alone in the same mistake:
http://www.cyberselect.co.uk/range/920
I remember now who makes the tool (or, at least, made the first).