Cook the pasta, while you chop up the ingredients. (Stir the fettuccini often otherwise it will stick together.).
Fry chicken till about 1/2 cooked, then add bacon, and fry for a further couple of minutes. Add crushed garlic, stir well.
When bacon is cooked, add mushrooms and shallots, fry for a few minutes, till mushrooms soften.
Stir in cream, simmer for about 2 minutes. Taste and add salt (or other herbs / spices) if desired. To thicken sauce, mix cornflour with small amount of water, and stir into sauce. Keep stirring, it should thicken in about one minute.