Don't skimp on the SSD. If you're spending £1200 it doesn't make sense to gimp your system with a budget SSD. A Samsung 850 EVO 250GB would be a much wiser purchase - better performance, better durability rating (approx double the 750) and more space (120GB will soon fill up).
Are the extra case fans necessary? Perhaps worth waiting and seeing how well the included fans cool things with your chosen case.
You could shave off £10 with 2666 Mhz RAM, I doubt you'd notice the marginal performance difference.
If you're going with the GTX 1060 you could probably shave off a few pounds with a 550W PSU.