Glamgirl
FIRST on WW LGW was notoriously short of trained crew, particularly after the 747 and 767 went to LHR, taking a lot of trained crew with them. I got it because I was on the bottom of the seniority list and no one else wanted to do it that day.
When I finally did my FIRST course, all of us in the group had being doing it unofficially for about a year.