SEAGATE Expansion STBX2000401 Portable Hard Drive - 2 TB, Black
USB 3.0 portable drive (contains 2.5" laptop HDD).
I haven't tried, but on other threads people say that the HDD inside is OK for XBone and PS4 upgraders.
It's a bit more than the Amazon deal, but that is out of stock. This is currently in stock and available for free home delivery or store collection. Part of their Black Tag promotion.
It's directly comparable to the current deal for a WD Passport 2TB at Argos for £59.99, which is scorching at over 1100 degrees. Some may prefer Seagate over WD, or Currys over Argos.
Edit: Sold out for home delivery now. Can still be ordered for store collection.
Edit 2: If you have an Amex card you could get it for £49.99 using the deal for £10 moneyback on a £50 spend at Currys. Thanks to the other posters.http://www.hotukdeals.com/deals/american-express-statement-credit-deals-pc-world-currys-costco-leon-restaurants-2068946