One pot lentil chicken

Name: One-pot lentil chicken
Ingredients: 1 tsp vegetable oil; 2 rasher lean dry-cure back bacon, trimmed and chopped; 2 large bone-in chicken thigh, skin removed; 1 medium onion, thinly sliced; 1 garlic clove, thinly sliced; 2 tsp plain flour; 2 tsp tomato purée; 150ml dry white wine; 200ml chicken stock; 50g green lentil; ½ tsp dried thyme; 85g chestnut mushroom, halved if large