I don't like jumping on these threads when they've already had so many posts but there's quite a few things I'd like to clear up:
Chromebooks and stream machines: Not worth the money. They are cheaper than regular laptops for a reason, because they generally lack everything that makes a laptop worth owning (storage, processing power, RAM, even a decent OS in the case of Chromebooks). Steer well clear of anything new that's under £200 because odds are it'll be a Chromebook or stream machine and won't fulfill your needs.
Someone mentioned that 2GB (I assume RAM) would "do well" but 4GB would be safe. This is really not true. Windows 10 is designed to run on somewhere between 1GB and 2GB of RAM, which doesn't leave much to actually do some work. I checked to see what I was actually using in terms of RAM right now, just to write this answer and Firefox was sucking up close to 0.5GB. Chrome is sits at similar numbers. If you are streaming from YouTube, or want to have a few tabs open while you do some coursework or basically want to do any multitasking you're really going to struggle on 2GB of RAM. Realistically speaking, 4GB is the absolute bare minimum you want to aim for in terms of RAM and spending a little more to get 8GB means you won't ever have problems and can comfortably use your laptop for several years without it feeling outdated or needing an upgrade.
Processor: Not really much to say here, you don't need anything fancy. A basic i3 or even something from Intel's Pentium/Celeron range would suffice. Again, if you're willing to spend a bit more then aim for an i3. It's quite a bit more expensive but this
is one of my default recommendations at the moment for people looking for a solid laptop. You'd never have any trouble with something like this and providing you looked after it I can see it easily lasting many years.
Display: I'm surprised this has not been mentioned. You're streaming videos so you want a nice 1080p display.
Overall I guess my recommendation would be this
, it's not top of the line but it'll suffice and would be a good mix of performance on a budget. If the budget were higher I'd absolutely recommend the £479 laptop that I linked above though.
At this point when browsing through the thread, I saw that the OP had already purchased a laptop and since I don't want to feel like I wasted the time writing this reply, I'm gonna post it anyway. Something to be wary of though, don't let Currys fool you into buying rubbish you don't need. The Office subscription you purchased would have been for one year, this time next year you will need to pay again. It would be better for you to not pay for the subscription and instead buy Office as a one off purchase. Rather than constant payments you just pay once and within 2 years you've saved money. Depending on the antivirus, you may have been ripped off there, odds are there would have been cheaper options available and in all honesty, common sense is a better substitute for antivirus. Finally don't bother buying the warranty. By default your laptop would come with at least 1, maybe 2 years warranty from the manufacturer. Currys warranty is therefore a waste and is completely unnecessary providing you look after your laptop. That said, considering the OP mentioned taking the laptop to the pub (which does not sound like a great idea) you may find yourself needing it.