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Heat oven to 200C/180C fan/gas 6. Brush the chicken with the peri-peri sauce, add some seasoning, then leave to marinate if you have time. Place half the lime in the cavity. Roast in the oven basting frequently for 1 hr 20 mins or until the chicken is cooked, covering with foil if the skin is getting too dark.
Cook the potatoes in boiling salted water for 12-15 mins until tender, drain and steam-dry for a few mins in the colander. Tip into a large bowl with the juice from the remaining lime half, the rest of the ingredients and some seasoning. Toss everything together.
Serve warm or at room temperature with the roast chicken.