Computer Upgrade (Will it work?)

take a look at GTX 760, same or better performance around £30 lower

30 GB SSD would be too small even for Boot drive. I would go to 60 GB minimum, so your OS will have enough space.

other 2 are fine
 
it wont work, believe me you need 120GB ssd, even 60GB isnt enough for OS

maybe you want to buy from different store
PCPartPicker part list / Price breakdown by merchant / Benchmarks

Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£63.36 @ Scan.co.uk)
Storage: Kingston SSDNow V300 Series 120GB 2.5" Solid State Disk (£56.98 @ Dabs)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£39.97 @ Amazon UK)
Video Card: Gigabyte GeForce GTX 760 2GB Video Card (£189.50 @ Ebuyer)
Total: £349.81
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-14 12:39 GMT+0000)