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Heat 1 tbsp of the oil in a large non-stick frying pan and fry the sausages in two batches over a medium heat for 15 mins, turning regularly, until nicely browned. Transfer the sausages to a large flameproof casserole dish.
Tip the onions and celery into the frying pan and cook over a medium-high heat for 5 mins or until beginning to soften and lightly colour, stirring regularly. Add a splash more oil if needed. Tip the vegetables into the casserole dish.
Put the remaining oil in the pan, cook the mushrooms over a high heat for 4-5 mins until lightly browned, then add to the casserole. Pour the wine and 300ml water into the dish and crumble the stock cube over the top. Stir in the chestnuts, tomato purée and bay leaf. Bring to the boil, then reduce the heat, cover loosely with a lid and simmer gently for 30 mins, stirring occasionally.
Meanwhile, make the mustard mash. Put the potatoes in a large pan of water, bring to the boil, then reduce the heat and simmer for 15-20 mins or until the potatoes are soft but not falling apart. Drain well in a colander, then return to the pan and mash with the butter and cream until smooth. Beat in the mustard, season to taste, and set aside.
Mix the cornflour with 2 tbsp cold water until smooth. Stir into the casserole and cook for 2-3 mins, stirring regularly, until the sauce has thickened. Remove the dish from the heat, season and sprinkle with chopped parsley, if using. Serve with the mustard mash.