Originally Posted by Loomer

Safe practice or not it doesn't state you need to record them as being sent, so how do you know that the document didn't reach them? Or that they didn't loose it? You get no feedback to tell you they have received a document from you, all you can do is wait to see if a v5 turns up which can take weeks, all that time you are left guessing if it arrived or not.
They certainly can't prove it so have no chance of getting money out of you for it. In court it would get laughed out.