You are NOT a Channel swimmer until you COMPLETE one. Until then you are an Aspirant.
Stop writing English Channel Swimmer or Channel Swimmer on blogs and email signatures when you haven’t swam a metre in the English Channel. Or any Channel.
EDIT: this isn’t aimed at people in general, but a couple of specific people. I’ve seen English Channel swimmer on an email signature of someone who is planning to do a one-way relay. Person has never been to Dover. Another has a website with it on, though they are not even an open water swimmer.
Poor original choice of title, updated.