Hey! I'm from Canada and I've been living in the UK for the past 4 years

A lot of things aren't as different as you might expect, but then some things are CRAZY different (in a good way). I have a scale that does kilos, lbs, and stones and it's from ASDA. I think I paid £7 for it or something, and about a month after getting it it suddenly stopped working, so I took it back and they were really good about getting me a new one. It's just a plain white plastic digital scale and I'm not sure how accurate it is really, but provided the number goes down I'm not too fussed!
ASDA is a great place to buy cheap home things, and food too. M&S and John Lewis are big department stores and as already has been mentioned, they are a bit expensive for things like that, but M&S has the best bras ever so if you need any while you're out here, stock up!

Argos is a catalogue store, so you go in or go online and look at the catalogue and then order stuff and they bring it out to you when you're at the shop. So you can't actually see the things before you buy them. That said, they have a great return policy and a lot of good deals.
Best of luck with the move! Enjoy Nottingham! I've not been there but I'm not too far away (in North American standards) in Cambridge. I've also lived in Southampton and Bournemouth and would recommend both if you spend any time down south.