The final classic of the flat season, the Betfred St Leger Stakes, takes places at Doncaster tomorrow (3.35 p.m.) and Irish handler Joseph O’Brien has an excellent chance of landing yet another big prize.

The jockey-turned-trainer son of the legend that is Aidan O’Brien has enjoyed a stellar season so far, plundering plenty of big races on both sides of the Irish Sea. Tomorrow his best chance of landing the Group 1 St Leger lies with Enceladus, who is likely to go off as the race favourite.

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Enceladus is unbeaten in three starts this season including winning the Group 3 Maison Perrier Gordon Stakes at Glorious Goodwood last time out. Tomorrow, Billy Loughnane deputises for injured stable jockey Dylan Browne McMonagle: one brilliant young jockey replacing an equally superb talent.

Yet another jockey enjoying her best-ever season is Saffie Osborne and she certainly worked wonders to land a handicap victory for this column a week ago, when she got course specialist Hickory out of all sorts of trouble to win at Ascot.

Tomorrow her mount HIGHWAYMAN, also trained by Joseph O’Brien, has a big task on official ratings to win the St Leger. However, the three-year-old colt is proven on both the ground and at the distance.........

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