Here are some links to more information and some forums which may help people affected by postnatal illness.
A BBC article
Talk Depression, an informative depression site containing, articles, members experiences of living with depression and other mental health issues and it’s effects, useful links and a peer support forum where you will be warmly welcomed by members who can understand how it can be.
netmums has loads of useful information and support for families but also has very good postnatal depression sections.
Advice and forums on PND - Australia-based.
Let me know if you find any more!