Hisense RS723N4WC1 American Fridge Freezer currently £449.99 at Marks Electrical. £499.99 less 10% applied automatically at checkout. Free next day / named day delivery.
This model has a non-plumbed water dispenser (ie. tank inside the door which you need to fill up, rather than being connected to your water main).
TopCashback has tracked for me at 3.03% of £499.99 so even better.
Also available in black for the same price.
Note - also this price at Argos but with slower delivery and less TopCashBack.