Welcome to the tribe, Uni!
First off, you can totally be paleo while at uni. Yes, alcohol is evil and non-paleo

but we all drink it on occasion. Try to at least cut down. I still drink but I consider myself to be paleo.
As for budget, I'm certainly on one as well! But cheaper cuts of meat are still good and most big supermarkets do deals on fresh meat that is reaching it's sell-by-date. Buy it cheap and put it straight in the freezer, then defrost it when you need to eat it.
Cheap sausages aren't really paleo as they contain a lot of rusk and wheat. Bacon is very paleo - check out
www.marksdailyapple.com - he's absolutely obsessed with bacon! (Because it's full of protein and good fat but no carb).
Your feast was paleo with the exception of the cheap sausages, the peas and the sweetcorn - corn (grain) and peas (legumes) are not allowed. Also, perhaps a little less meat/protein and a few more vegetables to even things out?
Falcon