Theres a new foundation which was set up in Aug 2011, with an aim to help those with pre or post natal depression. The helpline is fantastic - I'm a volunteer on the helpline as well.
If you need advice about anything, just want a friendly chat, feeling really down, even suicidal, or would like to know where you can go to recieve more support, then call PANDAS.
The website is www.pandasfoundation.org.uk/index.html
Pandas volunteers are very friendly, and have had pre/post natal depression themselves, but can give good, honest advice having 'been there and done that' Hope to hear from you soon! :)