Here is a summary of the whole topic. That page provides abstracts and puts the topic into context, then links to the "cost of children" articles below. If you don't know how much children cost, you will never understand child support.
Comparisons between the current scheme and the reformed scheme
I've put lots of government formulae & statistics into spreadsheets to try to understand what is going on, and who will be the winners & losers when the reformed formula starts. Here are the articles available: