Reading a book called "Beaufighters, BOAC & Me" by Sam Wright. He was a Navigator on Torbeaus with 254 squadron flying out from North Coates over the North Sea attacking shipping.
His is the first of the Beau books from someone who flew Torbeaus and he was describing training to drop torps in Beaus.
"For simplicity each exercise had an abbreviation. ALT (Attack Light Torpedo) was innocuous enough so we progressed to ART (Attack Running Torpedo). We then tackled the more difficult flying in the FALT (Formation Attack Light Torpedo). When the attack was done with running torpedoes the abbreviation FART was used..."
You can't make this stuff up