Boston baked beans with bacon

Name: Boston baked beans with bacon
Ingredients: 500g/1lb 2oz dried haricot beans, soaked overnight, drained and rinsed; 300g/10½oz piece pork belly, cut into thick chunks; 100g/3½oz smoked streaky bacon or pancetta, cut into thick slices; 1 large onion, finely chopped; 100ml/3½fl oz red wine, sherry or bourbon (optional); 4 cloves; 1 blade mace; 1 bay leaf; 1 thyme sprig; 400g tin chopped tomatoes; 3 tbsp black treacle or molasses; 1 tbsp English mustard; dash Tabasco (optional); dash Worcestershire sauce (optional); salt and freshly ground black pepper