A BUSY morning on the Sha Tin work tracks yesterday with Bruce Hutchison's subscription griffin, Pretty Long Legs, looking in outstanding condition. Hutchison's horses generally catch the eye in the paddock but, even allowing for this, his impressive debut winner seemed in the pink. His coat had a gleam to it and while he didn't run time under John Marshall, he had a fluency to his movements and an eagerness to get out there and run. There had been concern as to how the son of precocious sire, Rory's Jester, would come out of his facile Happy Valley triumph where he sat in behind Turf Champ and Plentiful Harvest before lengthening clear in the straight in the style of a useful prospect. He has suffered from suspensory ligament problems since his yearling days but yesterday he appeared as sound as a pound. He would be a very interesting runner on Saturday down the straight 1,000-metre course. He has been seemingly rated to a favourable mark of 54 in Class Three for his Valley win which was accomplished in a time 0.2 seconds faster than American Star took the preceding griffin heat that day. But then he is only a two-year-old and will be competing against the older horses should he take up his engagement. This makes his task considerably more difficult but not insurmountable. After all, last season's top British two-year-old filly Lyric Fantasy beat the older horses in the Group One Nunthorpe Stakes at weight-for-age. Pretty Long Legs stable companion, Cash Bonus, was also noted working well, this time on the inside track in company with Lucky Pal. Cash Bonus was a good second to Best Runner over the Valley mile last time out, when reappearing after a break, and has another win in him. Plentiful Harvest, who was burned into the ground in Pretty Long Legs' race at the Valley, remains a more than useful griffin prospect. Yesterday he went very strongly to the line under Johnny Ho and should show much improved form next time out. Horses improve most from their first run of the season to their second. This is even more so for those racing for the first time completely. In an informative morning for griffin watchers, there was also a pleasing piece from Tony P.H. Chan's strapping American-bred private purchase griffin Bounty. He came in for considerable support on his debut only to get very stirred up, race too freely in front and then hang across the track. He eventually finished last to Flirting Dancer that day only to confirm original trackwork impressions when staying on well to be third to Pretty Long Legs at the Valley. He was ridden very wide that day and again hung out in the straight. But at least he raced to the line. Yesterday, he confirmed he is progressing well with a strong piece under his trainer. He strode out well over his final 400 metres and should give a good account of himself next time out. Ivan Allan has a strong hand in the griffin department, not least with Explorer who had a dream rails run on his debut to run second at big odds behind Flirting Dancer. Yesterday, Explorer was another griffin to work in encouraging fashion, keeping tabs with stablemate Mighty Mighty on his outside. He is another to keep on the right side of. Patrick Biancone worked his intended Derby runner Charming Talker on the grass yesterday morning in the first serious hit-out since the New Zealand import was sidelined and forced to miss the Blue Riband event. Biancone also had International Bowl third, Quicken Away, out on the grass. He looked none the worse for his exertions and is being aimed at the end-of-season sprint championship, the Chairman's Prize. There were also two trials on the main equitrack with Derek Cruz's Rocketeer keeping on for more resolutely to claim the first heat. Rocketeer has become a bit of a disappointment in his races and has also gone off in his work prior to yesterday's trial. He had worked very erratically on a couple of occasions but yesterday raced straight to the line to hold Wong Tang-ping's Natal. The latter has failed to do anything in recent seasons but there was a glimmer of hope as went to the post under a tight hold. Alex Wong Yu-on's Due Diligence led and went clear in the second trial, looking as if he were going to win by several lengths when they swung for home. He was then eased down by Johnny Ho, who is not known for giving too much away during trackwork, to hold on by a head from Gary Ng's newcomer, Sure Win King. The latter impressed as he strode to line under Danny Lee and is one of many lightly-raced horses in Ng's stable worth keeping tabs on. First trial: 1, ROCKETEER (G. Childs); 2, Natal (D. Lee); 3, Valiant Red (N. Tiley). Others (in finishing order): Yummy Yummy, Chung San, Hattrick, Royal Killer. Time: 1.03.3 (23.8). Distances: 1 length, 11/2 lengths. Winner trained by Derek Cruz. Second trial: 1, DUE DILIGENCE (J. K. S. Ho); 2, Sure Win King (D. Lee); 3, Diamond Coast (R. Thompson). Others: King Spot, Winner's Special, Sky High. Time: 1.03.9 (24.5). Distances: Head, 10 lengths. Winner trained by Wong Yu-on.