She said: "Mumsnet users have been calling for help with the ever-rising cost of childcare, which is a serious impediment to many mothers returning to work after children, for some time, so we welcome the additional funding going into this scheme.
"However there is concern that single-parent households might lose out whilst some very high earning two-parent households will benefit.
"A couple could earn £300,000 a year and still benefit. That doesn't seem sensible and is inconsistent with other cuts, such as those to child benefit and to childcare tax credit.
More top news
A bid to hold a new inquest into the death of Stuart Lubbock - who was found dead in Michael Barrymore's swimming pool - has been blocked.
Scientists exploring the huge underwater labyrinth in Mexico have found remains suggesting it was once used by the Mayans.
A wolf which escaped from an animal sanctuary after a fence blew down has been recaptured after five hours on the loose.