Caramel apple loaf cake

Name: Caramel apple loaf cake
Prep time: 20 min
Cook time: 1 h 30 min
Total time: 1 h 50 min
Cuisine: British
Ingredients: 175g soft butter plus extra for greasing; 175g golden caster sugar; 1 tsp vanilla extract; 2 eggs; 225g self-raising flour; ½ tsp cinnamon; 4 rounded tbsp Greek yogurt; 2 eating apples; 50g walnuts very roughly chopped, plus 1 tbsp extra, chopped; 50g soft toffee (we used Werther's chewy toffees); 2 tbsp double cream