Seven-year-old Illustrious Blue eventually won the Group Two contest by a length and a quarter, with Purple Moon third.
Trainer Knight said: "It's the third time he's won at Glorious Goodwood and a different trip each time, so what a star. Jim gave him a lovely ride.
"I regrettably should have tried him over two miles last year, but we've had a fantastic run with him and he keeps on winning for us.
"Jim has put a lot of good work in on the horse - he knows him so well.
"It's great teamwork from everyone at home because we're a smallish yard.
"To have a horse like this to come along makes a big difference to everybody."
Meanwhile, Clive Cox, trainer of 33-1 runner-up Electrolyser said: "I'm really pleased because he has proved as good as I thought he was.
"There is more to come as he has not been scoping right and we've had to be patient to get him back.
"There are a few interesting races in France as well as over here to think about."