Amanda Perrett's Pulborough yard in West Sussex has been quietly effective this season, already sending out five winners. Perrett is not a trainer who tends to run horses before they are ready, so the fact that Sky Mountain is being sent out suggests the horse has shown enough at home to warrant the step up to a racecourse. How the two-year-old handles that crucial first experience will tell us a lot about where this horse sits in the pecking order. There is always an element of the unknown with a debut runner — you can have all the right breeding and preparation and still find your horse does not take to racing — but Perrett's record suggests she knows what she is doing with her runners. This one is worth watching to see if it justifies the faith being put in it.