Looks like a well thought out build to me, there's nothing I'd suggest you SHOULD change.
Suggestions:
If you're using the Corsair fans as case fans I'd move to either their AF series or look to Phanteks, Noctua, Sythe or Noiseblocker for quieter alternatives.
If money's available, aim for a <>256Gb SSD, that way you can at least drop a few choice games (or applications or key data) onto it and spare the mechanical HDD some work and yourself some waiting time.
Again, if money's available, look at the GTX1080, it's a good deal faster than the GTX1070 and you can find good ones them for the £520 mark.
The above are just ideas, as I said before, you already have a very well sorted rig there.