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
'Water Rats' gang leader killed after Briton murdered
Three alleged neo-Nazis, including two British soldiers, are set to stand trial in March next year, a court has heard.
ITV's Tonight programme tracks down the Romanian criminal mastermind behind one of Britain’s biggest jewellery heist gangs.