Heat a little oil in a pan. Add the pancetta and chilli and cook until the pancetta is lightly browned.
Add the tomatoes, season with salt and cook over a low heat for around 30 minutes. Reduce the heat to minimum and stir in the cream. Cook very gently until the sauce starts to thicken – about 5 minutes.
Cook the pasta, drain and add to the sauce. Cook for 30 seconds or so, stirring all the time, to allow the pasta to take up the sauce.