I managed to make this into a perfectly delicious spaghetti bolognese anyway. What I do when using cheap mince is to fry it up first with no extra oil and then strain it. This gets rid of most of the fat so that it can be used in whatever dish you like without creating a greasy mess. Whilst it was straining it I sautéed onions, garlic, pepper and mushrooms in a little olive oil and then I added the mince, 2 cans of tomatoes, tomato purée, dried mixed herb, a stock cube and some salt and pepper and simmered it all up whilst I cooked the spaghetti.
I need a longer weekend!