If you have a slow cooker that has a sauté function, spray with some low calorie cooking spray, allow to heat up and add the onions, garlic, chopped chilli, carrots and peppers.
If your slow cooker doesn't have this function then sauté the veg in a large frying pan
Stir in the chilli powder, Worcestershire sauce, Italian herbs and cook for another minute or so
If you're using the sauté function on your slow cooker, turn it to slow cook, put the lid on and leave it for 3 or so hours (on medium to high). If you're using a pan then transfer it to your slow cooker and cook for about 3 hours (on medium to high)
After 3 hours taste it, add a few drops of hot sauce and Bovril if you're using it and some more chilli if it's not hot enough. Add the washed and drained kidney beans and adjust the seasoning if required.