Search the Internet, you may be able to find a Miele around the £500 mark.
Others to consider would be ISE, (5 year parts and labour warranty) a search on google for ISE appliances should find them for you, Siemens (when they have their 5 year warranty deal on).
Cheap machines worth considering, John Lewis own brand, 3 year warranty.
Not recommended.
Hotpoint, Creda, Indesit and Ariston are all from Indesit.
Hoover and Candy, both are from Candy.
AEG, Zanussi, Electrolux, Tricity Bendix, all the same from Electrolux group.