Pre heat the oven to 200C/400F.
Put the potatoes and 1 tbsp of the oil onto a baking sheet. Cover the potatoes with the oil and bake for 15 minutes.
Add the onions, peppers, garlic cloves with the herbs and salt and pepper and the extra 1tbsp of oil. Mix thoroughly and return to the oven for 15 minutes.
Meanwhile, wrap the cod loin fillets in the pancetta.
Remove the tray from the oven, add the tomatoes, olives and cod fillets wrapped in pancetta for another 15 minutes or so until cooked through (be careful not to overcook!)
When cooked, sprinkle with fresh basil and serve.
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