Siemens WM14E162GB 7Kg 1400Spin Washing Machine in White
Normally around £499, I think it's been down at this price before at John Lewis, but out of stock there and other places. Even better now, as pointed out in comments, using CFS0810 code for £20 off, making it £379 before cashback.
There is an offer on at the moment until 31st Oct 2010 where Siemens will give you a 5 year guarantee on this washing machine (http://www.siemens-home.co.uk/home/learn-more-about/product-focus.html?article=siemens-5-year-guarantee&category=features-and-benefits)
Seems like a good deal to me for a decent brand with 5yr guarantee.
In fact, there are two other places a bit cheaper, but not had dealings with either but I guess with a guarantee direct from Siemens it might not matter:
£380 from Electrical123.com http://www.electrical123.com/products/ProductDetail.asp?ProductCode=SMN-WSH-WM14E162GB-W
£360 from Fire-Cookers.co.ukhttps://www.fires-cookers.co.uk/product/0/2897/Siemens_WM14E162GB_60cm_Washing_Machine.html
And finally - Quidco at 2%
-taylope1 "5% at topcashback"