Swordlestown Little's Mariann Klay, who along with her husband Des Leadon bred the impressive G3 Chester Vase winner and new Derby favourite Arrest (Ire) (Frankel {GB}), says that soft ground will be key to the Juddmonte colt's Epsom challenge. Arrest, trained by John and Thady Gosden, shot to the head of the Derby market after sluicing up in his favoured testing ground at Chester on Wednesday. That prompted bookmakers to propel Arrest to Derby favouritism at odds of 6-1, usurping 2,000 Guineas disappointment Auguste Rodin (Ire) (Deep Impact {Jpn}). Klay...