Well I suppose it's a start. My daughter is a single parent with three kids, two of preschool age, eldest is 8 youngest 18 months. She has never been out of work, though without tax credits she most certainly could not work without these as child minding is too expensive. She finds that working and being a single parent difficult and tiring but would have it no other way. With tax credits being available I fail to see why single mothers can object to work.
http://news.bbc.co.uk/1/hi/uk_politics/6418305.stm
http://news.bbc.co.uk/1/hi/uk_politics/6418305.stm