Heat oven to 200C (180C fan), Gas 6 and cook the sausages (if using) in a roasting tin for 20 minutes until golden brown.
Heat the oil in a frying pan and fry the mushrooms for a few minutes, to brown, set aside
Add the cheese to the pan and heat gently until melted.
Add tomatoes and mushrooms, mustard and worcester sauce.
Add the flour and heat for 2 mins thicken the mixture.
Toast the bread on one side and remove from grill
Spread the cheese mixture on to 4 slices of toast
Toast under the grill until golden
Remove from the grill and serve with the sausages, if you like.
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