1. Place sugar and water into mixing bowl and heat 4 min/100°C (212°F)/speed 2, until sugar has dissolved.
2. Add ice, cucumber, lime juice and finger lime powder, if using, and blend 30 sec/speed 9.
3. Add gin and soda water and mix 10 sec/speed 4.
4. Place extra ice cubes into tall glasses and pour over cooler.
5. Garnish with cucumber slices to serve.