Here is the link that every person should put in their bookmarks.
http://www.ukwhitegoods.co.uk

There is a sticky on exactly this subject.You need to do a 90 degree wash with a biological powder like Ariel.Low temperature washes without biological powder encourage mould to grow in your machine.

On this site,there are forums where you can get advice on washing machines and dryers, kitchen electricals and much more and the boys are really helpful.