India 42 - close, but no banana
The Pig was specifically applied to the Valetta Nav trainer. While the two aircraft had similar porcine outlines (ignoring u/c), the Nav trainer had a row of astrodomes along the upper surface giving the appearance of a line of teats as per nursing sows. The soubriquet additionally became more associated with the Valetta C Mk 1 rather than the Varsity.