Pesto chicken stew with cheesy dumplings

INGREDIENTS

• 2 tbsp olive oil
• 12-15 chicken thighs , skin removed, bone in
• 200g smoked bacon lardons or chopped bacon
• 1 large onion , chopped
• 4 celery sticks, chopped
• 3 leeks , chopped
• 4 tbsp plain flour
• 200ml white wine
• 1l chicken stock
• 2 bay leaves
• 200g frozen peas
• 140g sundried tomatoes
• 140g fresh pesto
• small bunch basil , chopped
• 140g butter
• 250g self-raising flour
• 100g Parmesan , grated
• 50g pine nuts