Bring the water to the boilAdd the rose buds and reduce to a simmerSimmer for 5 minutes before adding the champagneAdd the sugar and stir until dissolvedSimmer while you prepare the gelatine by covering with cold water and leaving for 5 minutesRemove the champagne from the heatSqueeze the excess water from the gelatine and add to the champagneStir well until the gelatine dissolvesPour the jelly into glasses and refrigerate overnight to set