Due to the poor weather conditions the two barrier trials scheduled for Sha Tin yesterday were postponed until this morning, and trackwork in general was rather quiet as a result. There were several good pieces of work on Thursday, however, particularly on the riverside gallops. Champion jockey Douglas Whyte figured prominently in a number of stylish pieces of work, and the South African looks destined to pick up several winners in the near future judging on the horses he has been working recently. Whyte rode Geoff Lane's Grandioso, who worked with Rebel Leader on the riverside, and he was particularly impressive, gliding over 800 metres in 50.5 seconds and extending well in the final quarter in a slick 22.2 seconds. The unbeaten son of Kaapstad has strengthened up during the break and looks in fine fettle. Rebel Leader also worked solidly under Tony Culhane and, while he has been something of a disappointment, he looks to be ticking over nicely. Whyte has been spending a good deal of time working Alex Wong Yu-on's unraced Green Diamond, whose latest gallop saw him travel stylishly alongside stablemate Joint Peace. Green Diamond has been given a solid preparation in recent weeks and looks a nice individual who is worth following when he makes his debut. Peter Ho's progressive Monza King worked on the all-weather over 1,200 metres in one minute 21.4 seconds. The handy stayer is another who has done well in the off-season and he breezed home in the final quarter in 23.9 seconds under tight restraint from Whyte. Ho also appears to have Perfect Shadow making steady progress after the gelding's dismal showing in a barrier trial back in August. He has since trialled well and his 1,200-metre gallop in one minute 23.9 seconds was good work. He has really picked up recently and can be followed. Tony Cruz's Lightning Bolt narrowly failed to score on his debut when a short-head second to Triumphant Star, but the well-bred son of Barathea has come out of that race superbly. With Felix Coetzee on board, he cruised over 800 metres in 50.4 seconds, working home over the final quarter in a hard-held 23.5 seconds. He has come on in leaps and bounds since his debut and should take all the beating on his next run. Derek Cruz appears to have a nice type in the unraced Sensational. The son of Supremo worked over 800 metres down the riverside under Tony Culhane in a steady 48.5 (23.5) seconds. The impressive part of the gallop was the manner in which the brown gelding lengthened when Culhane gave him some rein, and he is worth keeping an eye on for the future.