By Bill Esdaile FRIDAY’s Oaks (4.30pm) could well be run on testing ground if the amount of rain that’s forecast does hit Epsom Downs. That’s sure to be music to the ears of connections of Ylang Ylang, who has shown all of her best form to date on a soft surface. She wasn’t disgraced in the 1000 Guineas last time, and I can see her improving for this step up in trip, so she rates the one to beat, but I’ve a suspicion that she could be meeting a rapidly improving filly in EZELIYA. Irish master trainer Dermot Weld has only won the Oaks once, when Lester Piggott rode Blue Wind to success in 1981,…