Bring the water and sugar to the boil in a pan, stirring occasionally. Add the peach, cook for approx. 10 mins. Remove the pan from the heat, cover and leave to infuse for approx. 1 hr. Strain the syrup (yields approx. 350 ml).
Iced tea / mocktail
Bring the water to the boil, remove the pan from the heat, add the teabags and rosemary, cover and leave to steep for approx. 15 mins. Remove the tea bags and rosemary. Add the peach syrup and lemon juice, leave to cool, then chill for approx. 1 hr. Serve the iced tea with peach slices, rosemary and ice cubes.