I have experience using a course based around a book written by Micahel and Teri Quinn called from Pram to Primary.
It is very informal yet also quite structured so you get a lot covered. We ran these courses at the project I work for (just about to leave to move house) and my now Partner is just completing one now. The NSPCC also do similar in our area at least.
As I will be doing this freelance when I move, I will be charging a nominal fee to cover costs whereas the project I worked with ran them for free. If anyone would prefer a free course then it would be worth getting in touch with Barnardo's, Surestart, NSPCC or your PCT (Primary Care Trust) as morningpaper points out they run within his/her area. Homestart or your Health Visitor should be able to help. There is also a 5 to Teens cours eby the same people and others.
I am looking towards running something on a weekend day (as this tends to get more Dads involved too) in and around London, i.e. Berks, Herts, Essex, Kent, etc.