I'm intrigued to know what possible sustained G requirement couldn't be met by the Hawk - perhaps with more thrust?
When it first appeared at Valley, wasn't it routinely flown at +8G? Until BWoS told the RAF that "You're eating up fatigue - and why so much G when you didn't take the Gnat / Hunter to the same limit?"
"Because we can....."
In your triggernometry days, Courtney, what limit was used during ACM?