Sprinkle a tbls or two of flour over chicken.
Brown chicken in pan with some oil.
Put carrot, celery and onion in slow cooker, add chicken and rest of ingredients.
Put on low for about 3-4 hours.
Remember you don,t need as much liquid when doing in slow cooker, if its a bit runny when finished, add tbls of cornflour mixed with tbls cold water to sauce.
If you don,t have slow cooker put in oven at about 160 oC for about 1 1/2 hrs.