Lemon curd & blueberry loaf cake

INGREDIENTS

• 175g softened butter , plus extra for greasing
• 500ml tub Greek yogurt (you need 100ml/3.5fl oz in the cake, the rest to serve)
• 300g jar good lemon curd (you need 2 tbsp in the cake, the rest to serve)
• 3 eggs
• zest and juice 1 lemon , plus extra zest to serve, if you like
• 200g self-raising flour
• 175g golden caster sugar
• 200g punnet of blueberries (you need 85g/3oz in the cake, the rest to serve)
• 140g icing sugar
• edible flowers , such as purple or yellow primroses, to serve (optional)