Reading many of the threads on Mumsnet it seems that a large proportion of contributors rely on Tax Credits to top up their incomes.
I don't know anyone who claims Tax Credits IRL but if I did I don't think it would change my opinion - I think people should be fully responsible for providing for their own offspring without any benefits.
I have stated on a previous thread that I DO believe that people should get some assistance if their circumstances change ( Redundancy/Ill Health) but only for a set period.
I don't think the government should pay for people to have multiple children that they can ill afford to provide for.
I would be interested to hear other views.