Personally i've always thought that the number of the Trade Group is a fairly crude, but useful sort of indicator to the trades usefulness, anybody any thoughts on that one ?
Strange, I've always thought of it as the bigger the number the more niff naff and trivia, unconnected with your primary duty, your trade gets lumped with by the powers that be.
Obviously those little numbers do very little other than take boxes out of planes and send them back to BAe (through us of course).