Preheat oven to 350°F Brown the chops in a non-stick frying pan, then layer up in a large flameproof casserole with the vegetables and thyme, seasoning between layers.
Pour off the excess fat from the frying pan and add the flour. Stir well to make a paste, then cook for 30 seconds. Stir in the stock to make a smooth sauce and bring to the boil.
Pour the liquid over the meat and vegetables and bring to a simmer on the hob. Cover and cook in the lower half of the oven for 2 hours or until the lamb is tender.
Garnish with the freshly chopped herbs and serve with green vegetables, if wished.