Pre-heat the oven to 200C/375F/Gas 6.
Heat one tablespoon of the oil in a wide casserole dish. Add the sausages and fry over a medium heat for 2-3 minutes until nicely browned all over. Remove from the pan and rest on a plate.
Add the remaining oil to the pan with the pancetta and cook for one minute, then add the onion. Cook for a further 2-3 minutes when the onion should be soft and the pancetta beginning to crisp.
Add the garlic and the mushrooms and fry for one minute more, then stir in the tomato puree followed by the mustard.
Turn up the heat and stirring all the time fry for about 30 seconds.
Pour in the brandy and allow the alcohol to burn off. Next add the stock and wine. Allow to come to the boil then season to taste. Tip in the butterbeans and put the sausages on top. Place in the oven and cook for 15 minutes.
Serve in deep bowls with a sprinkling of the parsley and loads of crusty bread.