Preheat the oven to 220C (200C fan or Gas Mark 7).
Add the potatoes to a large roasting tin along with two tablespoons of olive oil. Toss them around the tin to coat them, then add the onion, garlic, bacon and chicken pieces.
Place the lemons in the roasting tin. Season everything with paprika then place in the oven. Cook for 40 minutes.
Make sure everything is not overcrowded, otherwise it will not cook evenly. Divide the food between two large roasting tins if you need to.
In a bowl, add one tablespoon of olive oil along with the courgettes and some salt and pepper. Toss the courgettes until they are fully coated.
Once the cooking time is up, add both the courgettes and olives to the roasting tin. Then place back in the oven for 20 minutes until everything is golden brown and tender.