Basically, I think you're over-buying the entire system. That's, what, $1600 in USD? I got my gaming PC for half that, although I'm sure there is some European price inflation that makes that impossible for you. Still seems pretty high.

I suppose the question is what are you trying to accomplish, precisely? For instance:

Do you need a 120GB SSD if you're also getting a 2TB conventional drive? If you're using the SSD just for the OS to speed it up, you don't need nearly 120GB. If you're using it to install a couple of games you play long-term, then it's better. 2TB of disk space is really rather massive; I have most of my (somewhat large) Steam library installed on a 1TB drive, plus a bunch of movies.

Do you really need a 3.5GHz i5 instead of a 3.1GHz one? The difference on Newegg is $220 vs $180 (both much less than 160 pounds, by my bad math). I doubt it, unless you know the games you want to run are really super-CPU intensive, like large-scale MMOs (MMOs in general are processor-heavy, whereas many other games might be RAM-heavier).

Do you need 16GB of RAM? What do you have that will use that much? Will 12 suffice? Will 8? (probably)

Do you need a "good" case? Does it matter? You can find cheap ones. All that really matters, to me, is that everything fits and has air flow, basically. Some people care about aesthetics, but that costs money.

Do you need a liquid cooling system? and separate case fan? Actually, you should always get the best cooling system you can buy, because it'll extend your PC's life significantly, so probably.

Do you need 760 Watts from your power supply, for that setup? Really unlikely. You only need a power supply that matches what you plan to consume. You only have 1 video card, and a pretty standard setup, I really doubt it will pull nearly that much, although I'm no electrician, probably the weakest area of my PC knowledge.

Your video card, though, is randomly pretty cheap. If you have that money to spend you're going to be better served reducing other stuff and paying more for the video card, I suspect. If you want a really high-end system that's where the money should probably go.

I vastly, vastly prefer wired connections to wireless ones but I don't know your home network setup.

Don't forget that you have to buy an OS, keyboard, mouse, and monitor. I know you mentioned them, but they aren't cheap (well... the OS could be free, and sure, you could spend $25 total on the keyboard and mouse, if you really wanted to). Monitors are pretty expensive, though, especially if you want a really good one.

And buy from somewhere with a good warranty process, because sometimes parts are just bad. I really like Newegg, but I don't know if they are UK-viable.