Gin & tonic cake

Name: Gin & tonic cake
Prep time: 1 h
Cook time: 45 min
Total time: 1 h 45 min
Cuisine: British, European
Ingredients: 250g salted butter; 325g golden caster sugar; 4 eggs; 250g self-raising flour; 75g natural yogurt; 2 large limes, juice only; 75ml gin; 150ml tonic water; 1 tsp juniper berries, lightly crushed; 200g softened butter; 400g icing sugar; 2 tbsp milk; zest of 3 limes (using up those you've juiced, above); 2 limes, zested then 1 cut into thin wedges to decorate; 1 tbsp granulated sugar; lemon sherbets; ¼ cucumber, peeled into ribbons; party straws