Heat the oil in a frying pan and brown the guinea fowl on all sides. Transfer the meat to a casserole dish. Add the potatoes, carrots, parsnips, onions, thyme, rosemary, bay leaves, garlic and pour in the red wine. Season with salt and pepper and cover the pot with tin foil and secure with a lid.
Bake the stew in the pre-heated oven for at least 1 hour. Then remove the meat and vegetables with a slotted spoon and keep warm. Place the casserole dish over a high heat and sprinkle in the flour. Whisk constantly until the sauce thickens.
To serve, divide the guinea fowl and vegetables into four serving dishes and drizzle generously with the thickened sauce. Serve immediately.