Whole tandoori chicken with coriander chutney

INGREDIENTS

• 1.5kg/3½lb whole chicken
• 4 tbsp natural unsweetened yoghurt
• 1 tsp garam masala
• 4 tbsp single cream
• 2 tbsp medium-hot paprika
• 1 tsp medium-hot chilli powder
• 1 tsp ground cumin
• 2 tbsp lemon juice
• 2 tbsp vegetable oil
• 1 tsp salt
• ½ tsp turmeric
• 1 tbsp tomato purée
• 4 garlic
• 2 tsp peeled and finely grated root ginger
• 100g/4oz coriander
• 3 green finger chillies, roughly chopped
• 1 garlic
• ½ tsp salt
• 1 tsp lemon juice
• 1 tsp demerara sugar