4m2½f (Grand National) Randox Grand National Handicap Chase (Premier Handicap) (GBB Race) (Class 1) (7yo+) It’s as if in the last week the punters have forgotten the credentials of the ante-post favourite in the aftermatch of the Cheltenham festival, Corach Rambler. Corach Rambler is effectively 10lbs well-in and has now…