Seagate Expansion 2TB USB 3.0 Portable 2.5 inch External Hard Drive - £57.99 Amazon.co.uk (Exclusively for Prime Members)
Samsung ST2000LM003 hard drive inside casing can be used to upgrade PS4 hard drive internally to 2TB. Works out of the box with MAC, PC, and Xbox One as an external hard drive. :)
Excellent price if you want to upgrade your PS4.
Give me some HEAT!!