South African sprinter J J The Jet Plane displayed his well-being ahead of Friday week's Darley July Cup in a workout at Newmarket on Thursday morning.Mike de Kock's ace was accompanied by a galloping companion in the pleasing spin on the July course.Juan Nel, assistant to De Kock, said: "He had a really good workout and we're extremely happy with him. He was really put through his paces and is looking extremely well, better than before Ascot."He added: "We are really looking forward to the race and I think you'll see a different horse at Newmarket."The five-year-old was fourth to Art Connoisseur when sent off favourite for the Golden Jubilee Stakes at Royal Ascot after making a successful British debut at Windsor. He is a top-priced 12-1 to take July Cup honours.