\link{http://www.guardian.co.uk/money/2012/feb/11/families-lose-tax-credits-labour\apparently this hasn't been well publicised?}
"Currently people on a low income can get working tax credits if they have at least one child and they are working at least 16 hours a week. But from April the rules for couples will change, and one partner will have to work 24 hours a week, or both partners will have to work a total of 24 hours between them, for them to continue to qualify.
"There are 212,000 families where parents work between 16 and 24 hours a week. They earn less than around £17,000 a year. According to Labour, if they do not increase their hours, they will lose £3,870 a year in tax credits. "