"The Xperia XZ Premium from Sony is a super-powered smartphone. It has the world’s first 4K HDR mobile display, IP67 water and dust-protection, and a camera capable of filming super slow-mo video."
Advertising £50 off the RRP of £649.99, however the price has not been updated yet during checkout. You can still receive the discount by quoting the deal over the phone, or by using live chat during checkout for credit afterwards.
You can also, potentially, earn another £10.00 via Quidco cashback bringing total price to £589.99 - but this is unlikely to go through due to discount.