Preheat the oven to 200°C/400°F/Gas Mark 6. Place the chicken on a baking tray and bake for 35-40 minutes. Remove and cool slightly, remove the bones and skin and tear the chicken into pieces.
Meanwhile, on a clean baking tray toss the ciabatta in 1 tbsp reserved pepper oil and bake for 8-10 minutes until golden.
Mix the drained peppers, tomatoes, cucumber and beans together.
Whisk the remaining pepper oil with the vinegar and toss into the salad with the basil, rocket, chicken and ciabatta.