How to make the cocktail Wibble

Name: Wibble recipe
Prep time: 3 min
Total time: 5 min
Yield: 1 cocktail
Cuisine: UK
Ingredients: 30 ml dry gin; 30 ml sloe gin; 30 ml grapefruit juice; 10 ml fresh lemon juice; 10 ml crème de mure; 5 ml sugar syrup