Current price is £499, enter MDA30 (expires tonight, on Sunday) to take price down to £469.
Potentially extra cashback of £13.09 from Topcashback, bringing price down to £455.91. Cashback tracked for me immediately.
Don't forget 5 year warranty http://www.samsung.com/uk/fiveyearwarranty/
The only difference I found between this and WW90K5410UX (http://www.hotukdeals.com/deals/samsung-addwash-9kg-ww90k5410ux-eu-washing-machine-graphite-549-99-currys-2520158) is that WW90K5410UX has ceramic heater, but not sure if I can trust Samsung website.