Although the RAF only ever wanted it (to begin with) as an Advanced Trainer, her heritage goes back through the Breguet 121 and the 1001 to the Taon - Breguet's entry into the NATO Light-Weight Strike Fighter competition that was ultimately won by the Fiat G91. Those early branches went off in another direction to produce the Etendard, which was chosen instead of the Anglo-French project to operate from French carriers. Wouldn't have fancied catapult launches in a Jag, from what I've heard of the available power (or lack thereof).