Double Result means if your horse finishes 'First Past The Post' you get paid as a winner, however, should your horse be awarded the race or promoted to a place, as a result of a Stewards' Inquiry or Objection which is announced before the 'Weigh In', you also get paid.
All bets placed on UK and Irish horse racing will be settled on First Past the Post AND the official result (i.e. the Weighed In result). The rules will be applied so that the settlement is always in favour of the customer.