SSD is only necessary if you want fast boot times and programs to run quickly. If you've got the money, by all means get one. I love 'em. :good:
I appreciate a lot of people here like PC Part Picker because it allows you get the cheapest prices, but I would always recommend buying from one store if you can. It just makes it so much easier if you ever need to send anything back, and you know it will all arrive together.
Not used Scan myself but I've heard they're not so good. Aria is meant to be OK. I actually like and use Novatech.co.uk myself. Whenever I've ordered from them, even with free delivery I've had it next day. :good: You could take a look at Overclockers.co.uk too. They're based up in Newcastle-under-Lyme I believe.
The GTX 760 is a good card but I think I'd go for a Radeon R9 270X instead if this is for gaming. It's about the same speed I think but is usually cheaper. They're good cards.
Maybe save on the CPU and motherboard by dropping the i5 and the Z87 board and instead going for an AMD FX-8320 and a 990FXA board. You wouldn't lose a lot of performance but your build would be cheaper. The Gigabyte GA-990FAX-UD3 would be a nice board to get if you go AMD. Alternatively, even the 970 boards are good.
You could put more money into the case that way. Maybe get yourself a Corsair 200R or a 300R or something a bit nicer than the Source 210. You could also afford a better graphics card maybe. So take a look.
You could also save money by getting rid of the aftermarket cooler. You don't need that right away unless overclocking. Save £37 - put it towards case or graphics card instead.
By making those changes you'd probably get a better gaming rig overall.