The flurry of open days at racing trainers yards in September heralds the imminent acceleration of the Jumps season. West Country heavyweights like Paul Nicholls and Colin Tizzard have both hosted owners' days in the past fortnight, drawing attention equally to established stars like Clan des Obeaux, who will target the £1m bonus for winning the Betfair Chase, King George VI Chase & Magners Cheltenham Gold Cup, and youngsters recently acquired, who may graduate to the top fli