Sticky toffee banana bread

Name: Sticky toffee banana bread
Ingredients: 125g soft butter, plus extra for the tin; 75g caster sugar; 50g dark brown soft sugar; 3 medium eggs; 2 large ripe bananas, mashed; 50g natural yogurt; 200g plain flour; 2 tsp baking powder; 50g pitted dates, chopped (about 10); 50g pecans or walnuts, chopped (or mixed chopped nuts); 100g light brown soft sugar; 25g butter, cut into cubes; 100ml double cream; 150g caster sugar; 50g pecan or walnuts (or mixed nuts); 50g banana chips; ½ tsp sea salt flakes