Chocolate Orange Swirl Bread

Name: Chocolate Orange Swirl Bread
Ingredients: 120g (4oz) unsalted butter, softened, plus extra for greasing; 150g (5½oz) caster sugar; 1½ oranges, finely grated zest only; 4 green cardamom pods, seeds only, ground; 1½ tsp salt flakes, ground; 330ml (11fl oz) full-fat milk, at room temperature; 90g (3¼oz) 0%-fat Greek strained yoghurt; 700g/1lb (9oz) strong white flour, plus extra for dusting; 12g (⅓oz) fast-action yeast; 115g (4oz) dark chocolate (80% cocoa solids), roughly chopped; 75g (2½oz) ground almonds; 75g (2½oz) flaked almonds; ¾ tsp cocoa powder; ⅔ bird’s-eye chilli, finely chopped and seeds removed; ¾ tsp ground ginger; ¾ tsp ground cinnamon; large pinch freshly grated nutmeg; 1 free-range egg, lightly beaten; 1 tbsp cacao nibs