The principal ingredients of the Great British Banger, currently the most popular form of sausage on the British mainland, are mechanically-recovered meat, pork fat, (lard) and bread, not necessarily in that order.
A resurgence of interest in proper food and regional specialities in the United Kingdom may hopefully see the demise of the GBB, which has already been banned by the EU from being sold as a sausage on the continent, due to its low meat content.