Sprinkle the joint with salt and pepper
Heat the oil in a pan and brown the beef joint on all its sides. Place in the slow cooker
Chop and peel the onions, carrots and garlic and place in the slow cooker with the herbs.
Pour the wine into the pan you used to brown the beef, and bring to a simmer then pour into the slow cooker
Add the stock to the slow cooker
Cook on medium for 4-5 hours, checking to see if done.
Remove the beef from the slow cooker.
Combine the water and cornflour.
Add the juices from the slow cooker to a pan and add the cornflour mixture to it
Bring to the boil stirring all the time until thick
Serve the beef with the sauce.