The current 20% off code for selected large appliances seems to apply to other brands too, such as Hotpoint! If you click the banner, it will only show a few brands / products but I just used the code to get 20% off a Hotpoint Extra Dishwasher FDFEX 11011 P (from £275 to £220).
20% off large appliances "glitch?" e.g. Hotpoint Extra Dishwasher FDFEX 11011 P for £220! @ Tesco