Grind or crush the bay leaf, fennel seeds, and chilli flakes together.
Toss the potatoes and olives in half of the spice mix, with salt, pepper, and 2 tbsp olive oil. Set aside for now.
Rub the remaining spice mix onto the chicken with 2 tbsp olive oil, salt and pepper.
Place chicken in a baking dish or oven-safe pan and arrange the potatoes and olives around it.
Tuck in the unpeeled garlic clove. Bake at 180°C/350°F fan (200°C/400°F conventional) for 30 minutes, uncovered.
Whilst the chicken is cooking chop parsley finely and combine with lemon zest in a small bowl.
Baste chicken with pan juices, increase heat to 200°C/400°Ffan (220°C/430°F conventional) for another 15-20 minutes until chicken is golden and cooked through and the potatoes are fork tender
Remove the peel from the roasted garlic and squeeze into the juices, mash gently, and baste the chicken and potatoes liberally with the pan juices.
Sprinkle over the parsley and lemon zest and add extra chilli flakes if desired. Serve onto individual plates and spoon over some of the pan juices. Lovely served with a green salad and fresh bread.