Cut ribs to fit into a 5.5L (22 cup) slow cooker. Place ribs, Massel Liquid Stock Beef Style, bay leaves and 3 crushed garlic cloves in cooker. Cover and cook on high for 3 hours 40 minutes.
Using tongs, transfer ribs to a shallow dish and cover to keep warm. Combine 1/2 cup cooking liquid with marmalade, mustard, 4 crushed garlic cloves and oil in a jug. Pour over ribs and gently toss to coat. Season.
Preheat a barbecue or char grill to medium-high. Cook ribs, turning occasionally and brushing with glaze, for 5-10 minutes or until lightly charred and sticky.