Banana custard eclairs

Name: Banana custard eclairs
Prep time: 50 min
Cook time: 30 min
Total time: 1 h 20 min
Cuisine: French
Ingredients: banana chips , to decorate (optional); edible gold spray or leaf, to decorate (optional); 200g white chocolate , finely chopped; 85g lightly salted butter , chopped into small cubes; 100g plain flour; 3 medium eggs , beaten; 2 overripe bananas; 100g golden caster sugar; 1 tbsp lemon juice; 4 tbsp custard powder; 300ml milk; 150ml double cream; 2 tsp vanilla bean paste (we like this for the seeds, but use extract if you like)