It's a while since Ilived in the UK, but I recall "British" sausages to be so full of filler (rusk) that they were more tubular fried bread than a fried meat product. I recall a "Yes Minister" episode in which hte british sausage was to be banned by a new EEC directive because they did not contain enough meat. here is asausage description from a Guardian article commenting on the introduction of the 2003foodregulations
"Here is a recipe for a school sausage, given to us by a manufacturer who prefers to remain anonymous. It is for what he described as a "pork product" made "down to a price" to win a local authority contract. The sausage contents: 50% "meat", of which 30% is pork fat with a bit of jowl, and 20% mechanically recovered chicken meat, 17% water, 30% rusk and soya, soya concentrate, hyrolysed protein, modified flour, dried onion, sugar, dextrose, phosphates, preservative E221 sodium sulphite, flavour enhancer, spices, garlic flavouring, antioxidant E300 (ascorbic acid), colouring E128 (red 2G). Casings: made from collagen from cow hide."
That's what Brits feed to your children for school lunch.
Hereis the Wikopedia section on British sausages.
here are various laws concerning the meat content of sausages in the UK. The minimum meat content to be labelled Pork Sausages is 42% (30% for other types of meat sausages), although to be classed as meat, the Pork can contain 30% fat and 25% connective tissue. Often the cheapest supermarket pork sausages do not have the necessary meat content to be described as "pork sausages" and are simply labelled "sausages"; with even less meat content they are described as "bangers" (an unregulated name).[16] These typically contain MRM which was previously included in meat content, but under later EU law cannot be so described