A very long time ago, I went on a tour of a client's plant for producing supermarket beef, to show the tax authority just how clever it all was. As you can imagine, they are pretty gruesome places. Not the abbotoir, but the "cow disassembly" bit. Where the carcases get frozen, stretched, chopped up, washed down etc. After the tour, I asked the tax inspectors where they'd like to go for lunch - and only at this point did one of them delcare herself a vegan (on animal welfare grounds) so would appreciate it if we could find somewhere that had a veggie menu. God only knows why they decided to send a vegan on that tour, she must have been traumatised.
As regards meat content of sausages etc: there seems to be a pretty direct corelation between cost and meat content. And as someone on a Keto diet, I have really noticed it: as the meat content reduces so the carb content increases. If you look at nutrition info for 2 basic pork sausages in my local supermarket:
PREMIUM
Sainsburys Taste The Difference (normally what-£2.50 for 6?): 97% meat content. 1.2g of carbs per 2.
Heck - about the same price: 97% meat, 1.4g carbs
Sainsburys Organic, £3 for 6: 85% meat, 0.9g carbs
STANDARD
Sainsburys "butchers choice", £1.50 for 8: meat 72%; carbs 12.2g
Walls thick pork sausages, £2.25 for 8: meat 70%; carbs 5.4g
BUDGET (although Richmond are more expensive than butchers choice)
Richmond, £2 for 8: 42% meat (!), 12.8g carbs
J James frozen, £1.40 for "approximately" 20: 42% meat, 10g carbs
You do get a few pretenders. Musks, for example, are £3 for 6 but you get 75% meat.
Personally: from a taste perspective I am no snob and I like any old sausage to be honest. I draw the line at tinned hot dogs, but I'd happily eat any of the above if nutrition info was ignored. Don't get me wrong - I'd rather eat the TTD to the Richmonds, but it's not like I couldn't face the taste of a greasy low quality sausage. However from a dietary perspective, it is really only the TTD and the Organic ones I'd have now. But no matter how you look at it.... Richmond sausages are the worst really. I'd genuinely go for the budget frozen ones instead.